I've bought two Cartier items from Fashionphile, a ring and non-love bracelet, and close to 60+ bags from them. The Cartier pieces came with nothing at all. I have never worried about authentication and have never re-authenticated. They willingly buyback their items, have a solid guarantee, and they employee people with extensive gem/jewelry backgrounds to check the jewelry. Certificates and receipts and paperwork are so easily faked that those really make no difference in my purchase decisions.