You can't redeem 48hr codes on xbox.com, only on the console.
Also I've got a gamepack in hand that I will ship to somebody for MS points, but I'm looking for something like 2300 MS points (odd numbered because I've got an odd number right now....), offer me a number and I'll let you know.
I'd play the game more, but it's impossible now, the CAPTCHAs come up invalid 9/10 for me no matter if they're right or not.