It's perfectly LEGAL to shoot a buck still in velvet as long as hunting season is OPEN. Though it is rare here, it DOES happen sometimes, and all a hunter has to do is call the warden to come out and acknowledge the fact the animal was taken legally so you can keep them. If you have any doubts even though it's rather clear to me in the regs, call your local warden or your nearest DNR service center, and they'll tell you everything you need to know.