How can I identify my unused duplicate Steam keys?
Let's say I have a list of a thousand Steam keys, mostly for different games. All of those games are already on my Steam account, mostly redeemed from keys on the list. That leaves me with perhaps 200 extra keys. How can I figure out which 200 that is?
Best Answer
Short of trying out every key one by one to tell what game it's linked to, no, there's no easy way to identify which key belongs to which game.
Thus, the easiest, simplest way, is to try adding the key to your Steam account.
If you do indeed own the game, Steam will not allow you to redeem game, telling you that you already own the game (including the name of it), and that the key will not be redeemed.
However, there is one caveat. Because you don't know which keys correspond to which games, if you have a key for a game you'd not like to add to your inventory (because you're a trader, for example), if you don't have the game in your library, it'll get added in right away.
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Can you check if a Steam key is used?
The only way to check is to attempt to use the key yourself. Steam support will not tell you if a key is valid or not. Don't buy used physical PC games that require keys to activate. Buy it for the physical stuff and just get the game on Steam if you somehow don't already own Half Life 2.What do I do with duplicate Steam keys?
The key cannot be registered again. If you received a duplicate CD key from your retail purchase you will need to contact the retailer who sold you the key. Steam Support cannot issue a replacement CD key.Can you use the same Steam key twice?
Each Steam key can only be activated in a single Steam account. You can however login using the same Steam account on more than one computer, but only one at a time. When logged into Steam all the games activated within that Steam account can be downloaded, installed and played on the PC.Can I check a Steam key without redeeming?
No, there is no way to verify a key is legit/unredeemed/a specific game. If you are unsure, don't sell it. The author of this thread has indicated that this post answers the original topic. No, there is no way to verify a key is legit/unredeemed/a specific game.Indiegala Feudalife Challenges - Steam Keys That Cannot Be Activated (Duplicate, DLC, Invalid)
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