That's a great question. The "promotion" ends March 8 - this is the last day that you can play the game for prizes. But I'm pretty sure the prizes can be redeemed long after March 8.
What I will do is this: when the auction ends, I will redeem one of my OTHER codes on my account and see if it works.
If it works, the winner will get this valid, unused code that I am auctioning.
If it is too late becuase the promotion ended, then I will send the winner SIX 10-point codes from 12-packs, for a total of 60 MCR points. Everyone wins.