Humble doesn't tell you if the key has been used or not. If it shows a key in green text with a redeem button(if you have your steam account linked) that means you revealed the key. If it shows a blue text with a link you made a gift link. the only Real way to know the key is not used is if it still says Reveal key or gift to friend.
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Hi!
On humble bundle website I went into library, on my account. I scrolled through it and saw a game I don't remember using or getting a key for. How will I know that it is unused because I want to gift it away here. It is a gift key and the text is blue the box that the link is in is also blue. The other keys are green. I assume it is unused then but I want to make sure because i don't want to get reported for a bad key.
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