To answer your first question - no, it will just say "Product Already Owned" (just checked it with a used key I bought for my wife yesterday).
I can't answer the 2nd question, sorry.
EDIT: I'd love a way to check to see if a key is used as well, as I have several that I am not sure whether I gave them to friends and they were used, or if they're still available. :/
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Sadly no. All you can do is try to activate it on an account that doesn't own it, which would be more than a check as it would be redeemed.
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Guess I'll just drop some keys somewhere and hope nobody's too disappointed.
Thanks for the answers.
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If I try to activate a key for a game that is already in my library AND is probably already used will it only tell me that it's already in my library? Is there a way to check if it's already used?
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