Based upon my recent luck in sales, my understanding of the system is this:
Everyone gets a raffle number. The 1st number gets all of his top pics, then the next and so on. This would make sense to me as if I win, I usually get more than one cap, because say you are 1st, you would get your top 5 caps. If you are second, you would also. Say the 10th person cannot get their first choice because it is sold out, so they get their next choice. And then it keeps going down the list until all of the caps are gone. If you are 50th, chances are all of the caps are gone, so you get nothing. This is all coded, as after the timer ends, the raffle is over in about 10 minutes and emails start getting sent out to the winners.