I bought two from newegg and both were used judging on the thermal grease on them. Both were in working condition. I believe one was returned because it did not overclock the way user expected, it was t'bred A. I don't know what was the problem with another but it was a used one as well. Both were cleaned carefully but the grease was still obvious.
So I guess it is all used that don't overclock well. Hopefully they are not damaged by overclocking attempts.