Winning key doesn't work - I can't enter the giveaways for that game now.

I won a game that I really want, so I was excited that I won, but then I tried the key and it didn't work. Now, that's no big deal I suppose, it happens, maybe the creator accidentally got a used key. The issue here is that I can't enter any of the other giveaways for that game that I'm seeing on the front page right now because it says I "previously won" the game.

Technically I won the game, sure, but I don't have it. I also can't mark the game as "not received" yet, because not enough time has passed yet. Is there any way I can cut through the wait of the "not received" time.. so that I can start entering giveaways for this game again?