Visit the URL; it'll tell you if it is or not. if not, don't give it your address, for obvious reasons.
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If it asks for your E-Mail address, then it IS fine. And you should give it your genuine email address because if you lose the key in future, you can enter your email address and all the keys associated with that address will be sent to you.
If it doesn't ask for your E-Mail address, then it's associated with someone else's email.
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So if it looks like this when I get to the page, was it used?
http://i42.tinypic.com/2bxnqg.png
It's been a while since I bought a bundle, and my memory is bad. :U
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Unused URLs look like http://www.humblebundle.com/?gift=XXXXXXXX
You can visit them and they show a form resembling a receipt slip, asking for your email address.
Once you've entered your email address it sends a new URL to the address you gave it and the gift URL stops working.
Used URLs look like this http://www.humblebundle.com/?key=XXXXXXXX
They have already been tied to someone's email address and are not for gifting.
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Glad to be of service :)
If you have a gift URL then don't forget to visit it to make sure it hasn't been claimed yet. Visiting the gift URL won't use up the gift as long as you don't enter your email address. If the gift has already been used then it will give you a little "Gift key already used!" message.
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I started a giveaway for an Introversion Bundle URL and I forgot to ask this question first, and I don't wanna get into trouble if it turns out to already be used. :U
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