I've got my Fendi B Bag on eBay right now. A potential bidder has asked me if it's authentic, how do I know, almost badgering me. I was very cordial and told them the bag was authenticated on the Purse Forum and I'm sure it's real. Then I looked at this person's feedback and saw they have 5 negs, plus they are selling items that I believe could very well be counterfeit. So I blocked this person from bidding on any of my auctions. Paranoid, or would you do the same thing?