I think I remember reading on these forums that even in years when they had a bucket of tickets for on-site guests, they always said they didn't have any when asked over the phone, but then when they would ask during check-in at the hotel they would be instructed to line up at 5am the morning-of. I think it was mentioned on one of the massive OBB threads, but maybe I'm misremembering. All that so say, I wouldn't completely lose hope that they might offer them at the desk until someone tests it out come Halloween season...