I need help regarding designer bags. At a yard sale, I bought 1 Chanel bag, 1 Prada bag and 2 Kenneth Cole bags. She had another Chanel bag but when I asked about it she told me it was fake so I didn't buy it. She said the ones I bought are authentic. I felt that by her telling me one was fake, she was probably being honest that the ones I bought were real. I do not know this person so now I am trying to determine if they are authentic or counterfeit. I would like to sell these on eBay. How do you authenticate a handbag? Thanks for any assistance you can give.