Incorrect. They do use CD-keys as a form of account identification, but only with copies that are retail, not digital. So if the code came on a sticker with a game, and you redeemed that, that's something you can use as ID. You can't use keys from digital sources as ID, as it requires you to write the support ticket number onto the actual sticker.
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When someone gives away CD keys in a public fashion, you should not post that you got it. Doing so could compromise your account because Valve uses CD keys as a way of retrieving a stolen account. This is extra important to take into account because most people have their credit card info stored which would allow someone to make purchases on your account.
Since you were expecting game keys here's one: SE3B2-FBQ8R-BCALR
Figure out what is wrong with it.
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