I have gotten 3 bags thru Mercari that claimed authentic, but wasn't (got it authenticated online). The last bag that I got duped on was a chanel. After I got my refund & seller got her fake bag back, she turns around & relist the same exact bag claiming its authentic (now I know that seller is intentionally bring deceitful. It irked me & told mercari. Mercari took couple days b4 deleting that listing. I was thinking of writing "replica" in black permanent marker inside of the bag, if & when this happens again. This should make it a little harder to sell.