Now, I know what the likely answer to this question is, though I'm trying my luck anyway.
I earned my Forerunner title just a few days before BL's launch, and completely forgot to redeem the code for the physical seal. Having checked, I was only late by 4 days, and was wondering if there was somehow some final way to get a code for it, as I notice that they're still for sale until December 1st.
I very much assume I'm completely out of luck, though having been collecting the physical versions of every seal I've earned thus far, I'll be really upset if I just now missed out on one by barely a few days just because I forgot.
Unfortunately, you're out of luck. You were required to generate the Code before the specific date.
I'm going to send you my own Code via PM. I won't use it. I don't want anything for it either, just that you enjoy it.