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I know the dev gave some away for free for testing the game... but I didn't think it was this many?
prior to the two pack being posted, if you bought the game at the 9$ price, he gave a key or two if u emailed/twittered him so you could play with a friend (thats how i got mine cause at the time there was no 2 pack)
the game gave cards
http://store.steampowered.com/app/239450/?snr=1_7_15__13