[Kaderin Triste]

Minus letting other stores know, that's all we can do too. And if they try to return stuff to us, we (a manager) can look up big items in the computer to confirm if it was purchased or not.
But all returns without reciepts also go onto "store credit" cards as well, which the managers can cancel. So if they steal something big and then return it and get it as store credit, we can basically recover the item.
Unfortunately that almost never happens. I suspect they go to either pawn shops or just sell on ebay or facebook marketplace.