Antiques Dealer: I can't exchange an item I want to!

Not all items in your inventory can be exchanged. The Antiques Dealer doesn't accept consumables like Forge Points Packs and Fragments. These items can still be deleted if you don't want them, but they can't be exchanged for Trade Coins. If you're unsure, check your inventory and it will show a delete button if an item can't be exchanged.