It doesn't have to be any specific key it can be any key activated on the account. This typically happens if you ninja a key drop.
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If you've got a key from a key drop (or any other source where the key was visible for others), you'll get these messages if a user tried to activate the key and asks for the account that activated the key (but like written above if it isn't their own they won't get an answer).
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Two points I get from this email:
If you did not request this query, please ignore this message – users cannot gain access to your account via the Find Account By CD Key process without access to your email account.
It seems like these 14 emails have something to do with a process recognized by Steam as "Find Account By CD Key". This is honestly the first time that I hear about this and any further details about this process and what is it good for will be appreciated. Since I don't know anything about it, I can only assume that it is a process where any user can see which Steam account has activated a specific CD key. Someone had probably the same CD key(s) like you and they were trying to find out who activated them, which is kinda suspicious, but not necessarily an attempt to cause harm, all would depend on the intentions of the users involved.
To further safeguard your account please read the following FAQs.
After implementing the "further safeguard" technology by Valve like Steam Mobile Authenticator Application, the given link will probably lead to recommendation of using their new mobile application which they are pushing down our throats lately in many ways. This may or may not be the reason why you received this email. If Valve resorted to using emails to induce fear of losing your account only to push you forward to their Steam Guard Mobile application, then it's a jerk move really.
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It was the Square Enix store, to get Hitman 2 for free: https://www.square-enix-boutique.com/product/287477/hitman-2-silent-assassin-pc-download
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It could be some key you won here or obtained on trade. Maybe the original owner forgot if that key was used or not and dropped it somewhere public, in case it was still unused. Happens often enough.
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Like everyone said, someone else tried to activate a key that had previously been redeemed on your account. When it didn't work, they clicked the umm, whatever it's called button. :) There's no way for anyone to get your account in that way, but apparently people do click it for some reason. :)
Some people will drop a key in public places, if they don't remember whether the key is still good or not. :) If you can't remember, you don't want to risk making a giveaway with it... :) So maybe a person you won a game from last year posted the key in the forum today. :)
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Today, I got 14 emails from Steam, all with the same message:
I never got this before, and I don't know how it could happen. Anyone has an idea?
PS: I activated a single key lastly, it was a legally bought key on an official online store.
PPS: Thanks for your help, here's a GA for a really great game:
http://www.steamgifts.com/giveaway/wsKGK/the-witcher-enhanced-edition-directors-cut
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