Okay, I think I have it figured out. WABKET tried to sell my bot keys using the onsite purchase. He cancelled it and it started to revert, but it didn't revert the whole trade. I only got 2 reclaimed back out of the 56 refined and 14 reclaimed. I saw the metal is still on his bot, so I think this should be a simple get me back the 56 ref and 12 reclaimed from his bot.

I am sorry that I made a mistake. I did not check carefully and thought that the dropped metal belonged to WABKET. It was a problem when an offline purchase is reverted the items would become lost items.

There won't be a perfect fix about this problem because the change of item ID cannot be tracked (items are traded back by Steam but all the item IDs are changed, mismatching the ID we have in the database). This should not be a problem though as if I do not make mistake the items are supposedly reassigned back to their own shop.