I would guess that a LOT of things that are being sold on Ebay are stolen.
No finger print required like pawn shops, so with a blind drop and stolen accounts it is quite easy to dispose of merchandise and not get caught -- plus it shifts stuff immediately out of state, so it isn't as likely to surface with the local law as fast.
That huge eBay seller they shut down that had liquidated hundreds of thousands to millions in stolen Home Depot merchandise was interesting.