Hmm, actually it does appear in My Packets (sorry, hadn't checked). I had looked in My Transactions and in My Housing. Housing even tells me:
If you would like to reserve a hotel room(s) from Gen Con's discounted room block you must first purchase a badge. Reservations will be made through Gen Con's Housing Portal. After you have purchased your badge, return to this page to access the Housing Portal.
note: my housing is arranged, I was simply alarmed that it doesn't know here that I have a badge.
Thanks for the response!