If you already own the game and try to activate it with a key, then it won't go through and will still be usable for someone else because it failed to redeem to your account.
So, yes, it's still valid.
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Note: Lets say you have game called Crayon Physics and you have key that adds 2 games lets say: Aquarium and Crayon Physics.
If you will use key your another Crayon Physics will dissapear but Aquarium will appear. It once happened to me (It could change)
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Would you like the knowing that you could kick a** right now in Sanctum with your friends but can't because some generous guy who was about to give you the key is stuck behind steam support that takes 2-3 days to even view your submited ticket? :D
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It is valid, but you will be unable to check if the key has been used or not.
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give me the key .. I will test it for you if it is used :) ^^
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So i have Sanctum on my steam acc and i was trying to activate another Sanctum key thinking that it will go to gifts (like coupongs did) but it says that i already have the product. It doesen't say that the key is in use or anything so how im i supposed to know is the key valid or not? I can't make a giveaway if i'm not 100% sure that the key works.
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