I can take your Agathion Charm and give you a box with another one of the same enchant value. But you must meet two conditions.
First of all, your Agathion charm must be powerful enough. It must be either a Greater one enchanted to +5 or a common one enchanted to +10.
Secondly, there should be only one Agathion Charm in your inventory. Otherwise there's a chance that powers of different Agathions will conflict with each other.
And thirdly, I don't work for free. To exchange +5 Greater Agathion Charm, you will have to pay 1 billion adena. And for the exchange of +10 Agathion Charm I will take 100 million adena.
What do you think? Are you interested?