The pins are on the motherboard, not on the CPU, although it could be burned. If it is fulfilled by amazon you have basically no risk - you can return it if it doesn't work. I would want to see much more savings before I risked it, if it was fulfilled directly by a third party instead.
I'd buy the "used" one on amazon or wait for a better price. The cheapest ones I see on amazon right are Amazon Warehouse deals, which has the same return support as amazon. I'd give it 50-50 that you'll get a completely unused, brand new processor that was a customer return from somebody with second thoughts (whether opened or unopened). Most of the rest of the time I'd expect it to be a working processor that just didn't overclock as much as whoever was returning it would expect, edit to add, or returned the processor when the motherboard or some other component was bad. Which is to say, Amazon warehouse deals for stuff like that is not used at all - it is customer returned or packaging damaged in the warehouse. (Some stuff actually is used - like video games, dvds, etc -stuff they buy back from you directly)