This time it worked, but... this new key was for Metro Redux Bundle!! Wow!!! For me it's perfect because I didn't have it in my library :D
But I can't mark the giveaway as received unless you change the giveaway title. You can do it by creating a new support ticket and selecting the category "Change Giveaway Game"... you know...

For when support request it, here is my agreement:

I agree to change the giveaway title to Metro Redux Bundle

Thank you so much!! Hope you have a great weekend! (^^,)

Don't you prefer to contact steamgifts support to change the giveaway title? I did it for some of my giveaways and after waiting a few days they changed the game with no problems (but only if the winner states their agreement, as I've done above).

Thanks for your generosity!! I will wait for your decision before touching the last key.