Didn't own a game when entered, gifted a copy, then won a giveaway, what do I do?

So I entered for a GROUP giveaway for a game that I did not own. Before the giveaway ended (it was a long one) I was gifted a copy by a friend and redeemed it. Now when this giveaway ended, I won. Obviously I can't redeem it for myself and it is against the rules to give it away. What should I do? Should I message the creator to reroll my win for someone else?