Hey, thanks!
But Steam thinks I already own whatever this key is associated with, so it might actually be the soundtrack for the original game, Guns of Icarus Online. I do own that soundtrack already, even though it appears to be gone from the steam store page.

If you want to contact support for a reroll, or for deleting the giveaway, that's fine as far as I'm concerned. Either way it's better that someone else can find real use for the key.

Cheers