They should have read into the fact that the raffle didn't say "exclusive costume". It probably won't be in a box next month, but Camp already said it will be available again.
If that going to be available again it should be the prize from the event too, like another Raffle or other events. I don't know but it should not in the costume box, because all of the winner already spent their money. If that will be costume box why those winner paid for?