in all fairness retail cpus have gone through such vigourous testing and quality control 99.99999% are gonna be mint. I have not seen a failed CPU in ages whereas I have come across loads of doa or unstable motherboards.
I would never have thought it was a bent cpu however the diagnostic process I would have followed at some point I would have reseated the cpu and hopefull notice then.
Touch wood the last cpu I ever had to deal with bent pins from new I thing was a skt939 so the pins were a lot thicker and noticing it bent was easy. It was also an OEM which I never buy anymore.