I want to sell a bag on eBay and I understand there will be a lot of people questioning authenticity. For LV, or Chanel etc., there are ways to prove, like date marks, in the bags. But for others like Botkier, how do you prove it's authentic? If you back it up with a money back guarantee, what happen if they receive the bag, exchange it to a fake and ask you for the money back?? It's such a headache just thinking about that. Anyone has a solution?? Thanks!