Isn't illegal for them to give you the game without a key for it? You should take it back with your receipt and tell them it was in complete and you want the key for it or an exchange for exactly the same game. I know you said no return after 24hrs but for the same game should be different story. The only semi excuse they have is if you bought it second hand but they shouldn't sell it in complete. If you can't get it sorted out least report them to steam. Good luck the game is really worth getting.
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