There is a key here.

So a month ago, I "won" a copy of SMNC from the forums from this guy. When he gave it to me, he asked me if I could help him purchase a Bemine bundle first as his card wasn't working somehow. So I thought, sure what the heck, and I gifted him one. He offered me free coupons but I didn't need any of them, so I just told him to send a $1 costume pack for Dungeon Defenders when his card was working again, and he agreed. He also sent me a 2nd copy of SMNC even though I said I didn't need it.

I never received the costume pack, and Steam tells me he is ignoring me right now. I'm not really sure what happened there, neither am I mad nor feel like I got scammed (it was just a dollar). But still... ಠ_ಠ

So yeah, all that aside, I have an extra copy of SMNC. Will give it away to the first person who can fill in the blanks:
"Look behind you, a ____ __!"
(Often used by a certain game protagonist, in an attempt to distract someone.)

Edit: Found a key in my mail: 43XZE-DJGAM-QFLI_ (GONE)