well - it is synonymous with Steam meaning of duplicate key and we're on Steam related forum, aren't we? Steam differentiate only 3 types of keys - valid, invalid and duplicate. valid key that was already used, be it by OP or a ninja - is a duplicate key.
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Omg. Screenshots. That's how I'm gonna start dropping my keys. Brillant! SCREENSHOTS! WHY DIDN'T I THINK OF THAT?
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I am not sure if these work but i am pretty sure they do. Let me know if you get them! :) ..
http://imgur.com/RmsNTC7
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