It was "This code cannot be redeemed (non existing or already used)".
I suppose you'd know, but I think I remember hearing that coupons don't work after 24 hours.
I will have to add you to a support list which will cancel your expired coupon and manually deposit the funds into your Gox acct. Please understand that this sort of thing can take some time. I need your email, order ID #, and Gox MX acct. # please.

I PMed you, appreciate the help.