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Сообщить о проблеме с переводом
The only annoying thing that could happen is people trying to "locate" the account that the key belongs to, causing emails to be sent to you informing you of such.
Those CD keys you're talking about are Retail CD Keys, and do count as valid proof of ownership. In theory, someone could hand you a key and then try to use that retail key as proof of ownership in an attempt to get Valve to hand over the account as a lost or forgotten account. This is why many sites such as Humble Bundle offer gift links, so that the person giving the gift can't see the CD key.
The reality of the matter is a little more tricky, because older proof of ownership is more powerful than newer proof. So if you have older CD keys or credit card information, you would be able to regain ownership by disputing it.
All of that said, I've never personally had to recover my account in that way and have no idea how the process actually plays out. They might also need some means of identifying the account specifically, such as the name used to log in, or the original email.
https://steamuserimages-a.akamaihd.net/ugc/867362133829606752/8F04FCFC80A9E0D8412EE6D54C14DA39B0B7EAB4/
I had to look through that process a few times when helping a few people and while making a guide regarding account recovery.
And that's also the physical retail CD key (hence why they ask you to attach an image) & same is outlined in the support article.