There is currently no safe way to check whether a Steam key is redeemed or not. Some Steam keys (like the Humble Bundle ones) are marked invalid if you try to activate and already have them in your library.
Your best bet is to give them to friends or use them yourself, in case they don't work.
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The only way to know what they are is use them. IF you already have the games, entering the code won't redeem them, just allow you to install it instead, but you also won't know if they were previously used by someone else. With keys, if you aren't certain and don't want negative feedback, a giveaway is recommended against.
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Well, you can't use them in a proper giveaway, so either redeem yourself, give to a friend or dump them in a forum. There simply isn't a way to check, no matter how much people want it. Steam simply hasn't bothered to set up a method to do so.
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That doesn't work, it tells you what the key is for but that is it added to your account, no way to undo that.
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not sure if he is actually trying to check the keys or just putting it up for someone to ninja
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Somehow i got 2 keys at my email, probably Alien Shooter 1 and 2. I want to giveaway them, but although i dont want to giveaway bad keys, can i somehow check them? and know is this really them?
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