Bought two unique items (one for myself, this being Six Demon Bag) and one to resell on the AH. Can’t even loot both (put in my backpack) at the same time? I don’t remember that being in 1.12?
Note: Even having one Six Demon Bag in my bank, made it impossible to loot another from my mailbox after it expired on the AH.
Unique items means exactly that, they are unique so you can only have one in your inventory. Inventory includes equipped, in backpack or bags and the bank.
you’ll have to vendor the one you have in order to loot the other one, and then you can mail the other one to a bank alt and buyback the first one
if vendor doesn’t work, then you’ll have to mail off the first one to a bank alt to get the second one, assuming that you haven’t equipped it