He is selling a counterfeit bag, which is illegal. You are not obligated to pay. I'm sure you can get your money refunded through Paypal. Hopefully, eBay will pull the auction as soon as enough people report it. In any case, you should open a SNAD (Significantly Not as Described) dispute with Paypal immediately. My only question is whether the buyer has to actually receive the merchandise before opening a dispute. I hope that's not the case. I hope you can get your money back before he actually mails that dreadful thing.