Here is what I have done in a similar situation...upon winning an item (not a bag) I strongly suspected it was not authentic after extensive review. I emailed the seller before I paid and said: if you have any doubts whatsoever of authenticity please understand that I fully intend to file all pertinent reports upon receipt of counterfeit items. Please, let's end the transacton mutually now before completion to avoid any problems. Guess what...they instantly agreed not to finalize transaction...they knew that I knew it was a fake and backed away and we were all happy.