Free: Contests & Raffles.
Yup. The law is in place to keep unethical folks that might pop a big buck or bull and then return later and say they "found" it. I won't argue with the validity of the law...but that's why it's there. Just as they say, "A few bad apples will spoil the barrel."
So is he supposed to go put it back and wait for the antlers to fall off the skull to take it home? I think I would call a gamey and get clarification. You did nothing wrong and it is just going to fall apart laying in the woods. Maybe they will let you keep it.