MIA: Drops card

[Asumi]

I have a particular problem that is quite difficult to prove, but happened nonetheless. I was attempting to put Drops cards into a Staff[3] and I got two of them in it successfully. When I double clicked the 3rd drops card in my inventory, the window that lets you choose which equipment to put the card in popped up, and at that time, someone requested a deal. I canceled the pop-up deal request and went to finish putting the card in the staff, and no longer have that card. The staff only has 2 cards in it, and I don't have a drops card in the inventory. I would really like the drops card back, but as I said, Its very difficult to prove, either way, lemme know what you think please.