Originally posted by pxpaulx The only two times I have bought from warehouse deals, they have been bumped/warehouse damaged outerboxes, and definitely not returns. Both were labelled as 'minor cosmetic damage'...in the case of my 15mm limited, it was mint in a box that had a minor corner ding. Considering they have the same return policy as amazon themselves, they are definitely worth a try if the price is worth it. YMMV!
Yeah, I'm certainly not suggesting that they are all customer returns, but some are. And even if it is a customer return, it could very easily be a return that has nothing to do with a stained sensor - could just be that someone changed their mind
FWIW, I've bought a couple Amazon Warehouse deals without issue.