diff --git a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java
index 1548c6fed6..22bf9a3716 100644
--- a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java
+++ b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java
@@ -26,7 +26,10 @@ import org.l2jmobius.gameserver.model.holders.PlayerCollectionData;
 import org.l2jmobius.gameserver.model.item.instance.Item;
 import org.l2jmobius.gameserver.model.options.Options;
 import org.l2jmobius.gameserver.network.GameClient;
+import org.l2jmobius.gameserver.network.SystemMessageId;
 import org.l2jmobius.gameserver.network.clientpackets.IClientIncomingPacket;
+import org.l2jmobius.gameserver.network.serverpackets.ConfirmDlg;
+import org.l2jmobius.gameserver.network.serverpackets.SystemMessage;
 import org.l2jmobius.gameserver.network.serverpackets.collection.ExCollectionComplete;
 import org.l2jmobius.gameserver.network.serverpackets.collection.ExCollectionRegister;
 
@@ -86,9 +89,18 @@ public class RequestCollectionRegister implements IClientIncomingPacket
 			return;
 		}
 		
+		PlayerCollectionData currentColl = player.getCollections().stream().filter(it -> it.getCollectionId() == _collectionId).findAny().orElse(null);
+		if ((currentColl != null) && (currentColl.getIndex() == _index))
+		{
+			player.sendPacket(new ExCollectionRegister(false, _collectionId, _index, new ItemEnchantHolder(item.getId(), count, item.getEnchantLevel())));
+			player.sendPacket(SystemMessageId.THIS_ITEM_CANNOT_BE_ADDED_TO_YOUR_COLLECTION);
+			player.sendPacket(new ConfirmDlg("Collection already registered;"));
+			return;
+		}
+		
 		player.destroyItem("Collection", item, count, player, true);
 		
-		player.sendPacket(new ExCollectionRegister(_collectionId, _index, item));
+		player.sendPacket(new ExCollectionRegister(true, _collectionId, _index, new ItemEnchantHolder(item.getId(), count, item.getEnchantLevel())));
 		
 		player.getCollections().add(new PlayerCollectionData(_collectionId, item.getId(), _index));
 		
@@ -96,6 +108,9 @@ public class RequestCollectionRegister implements IClientIncomingPacket
 		{
 			player.sendPacket(new ExCollectionComplete(_collectionId));
 			
+			// TODO: CollectionData.getInstance().getCollection(_collectionId).getName()
+			player.sendPacket(new SystemMessage(SystemMessageId.S1_COLLECTION_IS_COMPLETED).addString(""));
+			
 			// Apply collection option if all requirements are met.
 			final Options options = OptionData.getInstance().getOptions(collection.getOptionId());
 			if (options != null)
diff --git a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java
index 664309481f..5fbac08f53 100644
--- a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java
+++ b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java
@@ -21,7 +21,7 @@ import org.l2jmobius.gameserver.network.OutgoingPackets;
 import org.l2jmobius.gameserver.network.serverpackets.IClientOutgoingPacket;
 
 /**
- * Written by Berezkin Nikolay, on 13.04.2021
+ * @author Berezkin Nikolay
  */
 public class ExCollectionComplete implements IClientOutgoingPacket
 {
@@ -37,6 +37,7 @@ public class ExCollectionComplete implements IClientOutgoingPacket
 	{
 		OutgoingPackets.EX_COLLECTION_COMPLETE.writeId(packet);
 		packet.writeH(_collectionId);
+		packet.writeD(0);
 		return true;
 	}
 }
diff --git a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java
index 8c5acc7c08..2598e26462 100644
--- a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java
+++ b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java
@@ -28,7 +28,7 @@ import org.l2jmobius.gameserver.network.OutgoingPackets;
 import org.l2jmobius.gameserver.network.serverpackets.IClientOutgoingPacket;
 
 /**
- * Written by Berezkin Nikolay, on 12.04.2021
+ * @author Berezkin Nikolay
  */
 public class ExCollectionInfo implements IClientOutgoingPacket
 {
@@ -60,7 +60,8 @@ public class ExCollectionInfo implements IClientOutgoingPacket
 			{
 				packet.writeC(current.getIndex());
 				packet.writeD(current.getItemId());
-				packet.writeH(CollectionData.getInstance().getCollection(collection).getItems().get(current.getIndex()).getEnchantLevel()); // enchant level
+				packet.writeC(CollectionData.getInstance().getCollection(collection).getItems().get(current.getIndex()).getEnchantLevel()); // enchant level
+				packet.writeC(0); // unk flag for item
 				packet.writeC(0); // unk flag for item
 				packet.writeD(1); // count
 			}
diff --git a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java
index d4351a66f9..69c6812733 100644
--- a/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java
+++ b/L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java
@@ -17,24 +17,26 @@
 package org.l2jmobius.gameserver.network.serverpackets.collection;
 
 import org.l2jmobius.commons.network.PacketWriter;
-import org.l2jmobius.gameserver.model.item.instance.Item;
+import org.l2jmobius.gameserver.model.holders.ItemEnchantHolder;
 import org.l2jmobius.gameserver.network.OutgoingPackets;
 import org.l2jmobius.gameserver.network.serverpackets.IClientOutgoingPacket;
 
 /**
- * Written by Berezkin Nikolay, on 12.04.2021
+ * @author Berezkin Nikolay, Index
  */
 public class ExCollectionRegister implements IClientOutgoingPacket
 {
+	private final int _success;
 	private final int _collectionId;
 	private final int _index;
-	private final Item _item;
+	private final ItemEnchantHolder _collectionInfo;
 	
-	public ExCollectionRegister(int collectionId, int index, Item item)
+	public ExCollectionRegister(boolean success, int collectionId, int index, ItemEnchantHolder collectionInfo)
 	{
+		_success = success ? 1 : 0;
 		_collectionId = collectionId;
 		_index = index;
-		_item = item;
+		_collectionInfo = collectionInfo;
 	}
 	
 	@Override
@@ -42,14 +44,15 @@ public class ExCollectionRegister implements IClientOutgoingPacket
 	{
 		OutgoingPackets.EX_COLLECTION_REGISTER.writeId(packet);
 		packet.writeH(_collectionId);
-		packet.writeC(1);
-		packet.writeC(0x0E);
-		packet.writeC(0);
-		packet.writeC(_index);
-		packet.writeD(_item.getId());
-		packet.writeH(0);
-		packet.writeC(0);
-		packet.writeD(0);
+		packet.writeC(_success); // success
+		packet.writeC(0); // recursive reward
+		packet.writeH(packet.getWritableBytes()); // size
+		packet.writeC(_index); // slot index
+		packet.writeD(_collectionInfo.getId()); // item classId
+		packet.writeH(_collectionInfo.getEnchantLevel()); // enchant level
+		packet.writeC(0); // is blessed
+		packet.writeC(0); // blessed conditions
+		packet.writeD((int) _collectionInfo.getCount()); // amount
 		return true;
 	}
 }
diff --git a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java
index 1548c6fed6..22bf9a3716 100644
--- a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java
+++ b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/clientpackets/collection/RequestCollectionRegister.java
@@ -26,7 +26,10 @@ import org.l2jmobius.gameserver.model.holders.PlayerCollectionData;
 import org.l2jmobius.gameserver.model.item.instance.Item;
 import org.l2jmobius.gameserver.model.options.Options;
 import org.l2jmobius.gameserver.network.GameClient;
+import org.l2jmobius.gameserver.network.SystemMessageId;
 import org.l2jmobius.gameserver.network.clientpackets.IClientIncomingPacket;
+import org.l2jmobius.gameserver.network.serverpackets.ConfirmDlg;
+import org.l2jmobius.gameserver.network.serverpackets.SystemMessage;
 import org.l2jmobius.gameserver.network.serverpackets.collection.ExCollectionComplete;
 import org.l2jmobius.gameserver.network.serverpackets.collection.ExCollectionRegister;
 
@@ -86,9 +89,18 @@ public class RequestCollectionRegister implements IClientIncomingPacket
 			return;
 		}
 		
+		PlayerCollectionData currentColl = player.getCollections().stream().filter(it -> it.getCollectionId() == _collectionId).findAny().orElse(null);
+		if ((currentColl != null) && (currentColl.getIndex() == _index))
+		{
+			player.sendPacket(new ExCollectionRegister(false, _collectionId, _index, new ItemEnchantHolder(item.getId(), count, item.getEnchantLevel())));
+			player.sendPacket(SystemMessageId.THIS_ITEM_CANNOT_BE_ADDED_TO_YOUR_COLLECTION);
+			player.sendPacket(new ConfirmDlg("Collection already registered;"));
+			return;
+		}
+		
 		player.destroyItem("Collection", item, count, player, true);
 		
-		player.sendPacket(new ExCollectionRegister(_collectionId, _index, item));
+		player.sendPacket(new ExCollectionRegister(true, _collectionId, _index, new ItemEnchantHolder(item.getId(), count, item.getEnchantLevel())));
 		
 		player.getCollections().add(new PlayerCollectionData(_collectionId, item.getId(), _index));
 		
@@ -96,6 +108,9 @@ public class RequestCollectionRegister implements IClientIncomingPacket
 		{
 			player.sendPacket(new ExCollectionComplete(_collectionId));
 			
+			// TODO: CollectionData.getInstance().getCollection(_collectionId).getName()
+			player.sendPacket(new SystemMessage(SystemMessageId.S1_COLLECTION_IS_COMPLETED).addString(""));
+			
 			// Apply collection option if all requirements are met.
 			final Options options = OptionData.getInstance().getOptions(collection.getOptionId());
 			if (options != null)
diff --git a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java
index 664309481f..5fbac08f53 100644
--- a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java
+++ b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionComplete.java
@@ -21,7 +21,7 @@ import org.l2jmobius.gameserver.network.OutgoingPackets;
 import org.l2jmobius.gameserver.network.serverpackets.IClientOutgoingPacket;
 
 /**
- * Written by Berezkin Nikolay, on 13.04.2021
+ * @author Berezkin Nikolay
  */
 public class ExCollectionComplete implements IClientOutgoingPacket
 {
@@ -37,6 +37,7 @@ public class ExCollectionComplete implements IClientOutgoingPacket
 	{
 		OutgoingPackets.EX_COLLECTION_COMPLETE.writeId(packet);
 		packet.writeH(_collectionId);
+		packet.writeD(0);
 		return true;
 	}
 }
diff --git a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java
index 8c5acc7c08..2598e26462 100644
--- a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java
+++ b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionInfo.java
@@ -28,7 +28,7 @@ import org.l2jmobius.gameserver.network.OutgoingPackets;
 import org.l2jmobius.gameserver.network.serverpackets.IClientOutgoingPacket;
 
 /**
- * Written by Berezkin Nikolay, on 12.04.2021
+ * @author Berezkin Nikolay
  */
 public class ExCollectionInfo implements IClientOutgoingPacket
 {
@@ -60,7 +60,8 @@ public class ExCollectionInfo implements IClientOutgoingPacket
 			{
 				packet.writeC(current.getIndex());
 				packet.writeD(current.getItemId());
-				packet.writeH(CollectionData.getInstance().getCollection(collection).getItems().get(current.getIndex()).getEnchantLevel()); // enchant level
+				packet.writeC(CollectionData.getInstance().getCollection(collection).getItems().get(current.getIndex()).getEnchantLevel()); // enchant level
+				packet.writeC(0); // unk flag for item
 				packet.writeC(0); // unk flag for item
 				packet.writeD(1); // count
 			}
diff --git a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java
index d4351a66f9..69c6812733 100644
--- a/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java
+++ b/L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/collection/ExCollectionRegister.java
@@ -17,24 +17,26 @@
 package org.l2jmobius.gameserver.network.serverpackets.collection;
 
 import org.l2jmobius.commons.network.PacketWriter;
-import org.l2jmobius.gameserver.model.item.instance.Item;
+import org.l2jmobius.gameserver.model.holders.ItemEnchantHolder;
 import org.l2jmobius.gameserver.network.OutgoingPackets;
 import org.l2jmobius.gameserver.network.serverpackets.IClientOutgoingPacket;
 
 /**
- * Written by Berezkin Nikolay, on 12.04.2021
+ * @author Berezkin Nikolay, Index
  */
 public class ExCollectionRegister implements IClientOutgoingPacket
 {
+	private final int _success;
 	private final int _collectionId;
 	private final int _index;
-	private final Item _item;
+	private final ItemEnchantHolder _collectionInfo;
 	
-	public ExCollectionRegister(int collectionId, int index, Item item)
+	public ExCollectionRegister(boolean success, int collectionId, int index, ItemEnchantHolder collectionInfo)
 	{
+		_success = success ? 1 : 0;
 		_collectionId = collectionId;
 		_index = index;
-		_item = item;
+		_collectionInfo = collectionInfo;
 	}
 	
 	@Override
@@ -42,14 +44,15 @@ public class ExCollectionRegister implements IClientOutgoingPacket
 	{
 		OutgoingPackets.EX_COLLECTION_REGISTER.writeId(packet);
 		packet.writeH(_collectionId);
-		packet.writeC(1);
-		packet.writeC(0x0E);
-		packet.writeC(0);
-		packet.writeC(_index);
-		packet.writeD(_item.getId());
-		packet.writeH(0);
-		packet.writeC(0);
-		packet.writeD(0);
+		packet.writeC(_success); // success
+		packet.writeC(0); // recursive reward
+		packet.writeH(packet.getWritableBytes()); // size
+		packet.writeC(_index); // slot index
+		packet.writeD(_collectionInfo.getId()); // item classId
+		packet.writeH(_collectionInfo.getEnchantLevel()); // enchant level
+		packet.writeC(0); // is blessed
+		packet.writeC(0); // blessed conditions
+		packet.writeD((int) _collectionInfo.getCount()); // amount
 		return true;
 	}
 }