"I purchased what was advertised as an authentic YSL purse in August 2015. This past week, I wanted to re-sell the purse and therefore took it to be authenticated. I found out today that the purse is a knock off. I contacted BTR and was told that because the purchase was so long ago, there was nothing they could do about it. BTR purports to sell only authentic merchandise. They obviously do not stand by their claims. I absolutely would NOT TRUST the legitimacy of anything advertised on their website."