Did you sent 2 of the same key to both winners? That can happen sometimes.
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Check his profile to make sure he didn't activate the game and is trying to scam you (Highly doubt it, but worth a shot.)
If there's someone posting on his wall a lot (obviously a brother or best friend or something), you can check him, too, to make sure he's not trying to scam you for a second key for his friend.
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Which one? SS HD 2? That never shows on the profile unless you play it, so I'm distrusting of this winner.
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you could also send an email to humble bundle saying that the key was dupe
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Key drop it to test. If it works, the user was lying. Of course, he may have lied and traded / sold it, too.
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Looks like the guy marked it received. It was the SS1 you were having issues with right?
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You've got to be very careful when dealing with keys.
People of questionable morals can trade the key away while claiming it doesn't work. This is why you always record any conversation with the person receiving the key by using screenshots. Also, pirates can synthesize and use a valid key before it is even sold. In the latter case, you have to try and work it out with the seller and/or developer.
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^This
This way, he can't try to first trade it off (if he hasn't already). Ask him to do this in a chat through Steam, and ask him to be quick about it. This way, his window to try and trade it off is limited the most.
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I just did a couple of giveaways today but one user I sent a game to claims the product key is already used. I just had generated it from my Humble Bundle page so I'm not sure if that's true or if he just gave it to a friend or something. What should I do?
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