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Do you think they would announce if it was not "legit"?
Just go to kinguin and get a cheap key.
Which is no different than the ebay seller in question - either way its some chinese or east-indian bellycrawler selling sketchy MSDN keys (illegal, and key is subject to being blacklisted without notice). Might as well just go the ebay route if you're going to risk that - at least you've got buyer protection.