Oh yes they do! I know because they did it to me. I bought a LV purse from Goodwill to eBay, and I later found out it was fake. Fooled me though, it sure looked real. They threatened to ban me, even though I have no history of fraud, and 1500+ positive feedbacks. Another time I listed a Orange County Choppers (I believe it was) hat that I found at GW, and they told me it too was fake. I had no way of knowing though.