Oh my gosh this is burning hot news, and it looks like mystery codes are going fast. I was still able to claim one of the 1,000 codes at 5:51 pm Central, so you should definitely give this a shot!
Here's the link: click!
I haven't even logged in to see what my mystery reward was yet! LOL! I've seen reports of free Hoard Packs and even a FOG Unicorn. WOOT!
Best of luck and let me know what you scored!