Sorry for the addition which I write two years after your message, but such method is also not a big help. I mean the following: if you are trying to activate an inactive (or expired) key from a game that you already have in Steam, the system will tell you only that you already have such a game, but there will not be a message that this key have already been activated by someone else. I came across such a case recently in practice, alas.
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Check your profile if you activated the key, look here: https://store.steampowered.com/account/licenses/
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Since my Humble Bundle are linked with my steam account and the library, I'm afraid of the codes stop working or becames a invalid code...
That doesn't really happen. Just make the giveaways and create and deliver the giftlink once it is done.
I've had giftlinks show up as used when created in advance, a security flaw in the system most likely. But never with keys.
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I'm not sure if I have already used the game code that I have in my mail box... Does the steamgifts alerts me if it's something with a invalid code or used one?
The point is that I already have in my steam Library and the purchase was from Humble Bundle, there are 2 ways to get the key code, "Redeem on Steam" or "Gift to a friend"... There are almost no difference using one of them to get the code, but when I open to "Redeem on steam", show up some message saying that I have the game and if I choose this option I can't send it anymore as a gift and gives me the key code.... Since my Humble Bundle are linked with my steam account and the library, I'm afraid of the codes stop working or becames a invalid code...
I just want to get the code and post on the gift room... That way, I don't need to send it from e-mail for browser link address to the winner.
How confusing... >.<"
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