He maybe marked it as received when he got the key then realized the key didn't work.
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You can after 1 week, but I suggest you make a ticket to support, so they will solve it, and the giveaway creators will give you another key. Also there is always some notable % of users who never come back to get their won key from developer giveaways, which is very sad, there should be a way to "recycle" this "never received" keys to new giveaways at least in chat/forum, cuz when a game key is lost forever and never will be claimed is sad.
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I just entered in steam gifts and i won a key of nether. this gift for 50 accounts. well, i take the key i go to my account and try to activate it and its says to me that key is already activated in other account. Someone have a solution? (Sorry for my english i do what i can)
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