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Indeed, I'd call that "item not as described"

It's a shame eBay feedback can be padded by unscrupulous means.
I doubt you'll find any experienced guys here would have recommend that as a buy.
Do you have a lot of letters need opening ? :p ...

Hopefully it's not one of the $40 Pakistani made eBay specials or you just bought a letter opener. :shrug:

Sure it's possible & that falls into the incorrectly honed category that Glen has mentioned above..

Lateral movement or if a spike point you lifted the heel... & no a razor cannot be too sharp, it's a razor after all. :)