It will be nice and useful for items that are bound to the wallets (EnjinCraft access Token), or are locked to them at some time (Enjin MFT), that those items will show a Lock so the user knows that are not transferable.
As well in the send screen a red text: "Item not transferable / Item bounded to wallet" will be nice, and will make clearly visual to the user what items are not transferable.