Ah! What a fool. I guess I could always go first in trading and explain my situation. Hopefully people won't get annoyed by that.
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Well, you can check your trading history PLUS your account(s) activation history and try to figure out which keys are used and which are not.
As far as I know, there is NO way of checking without activating.
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So I did a thing. I wanted to make a google drive spreadsheet with all my games that I have to trade and all their keys so I would have everything in one place. So I revealed the keys on humblebundle as I was starting there but I never finished. Now I have no idea how to differentiate between the keys that have been redeemed and the ones that are usable. Any ideas how I can get around that? Yes, I was stupid.
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