The hood numbers may have been there but the blue drab if it had, it would have come off very easily. I've seen more cases of people trying to sand as you have to uncover them only to go to bare metal and think they have no numbers.....I'm somewhat guilty of that myself, having almost lost my own.
Sanding unless VERY patient and slow is NOT the best way if used as the only method. I've found with mine that a combination of pressure washer, carefully timed application of AIrcraft Clear and base remover, and a combination of fine coarse, wet and dry sanding is the only way to slowly strip paint to find the origional markings.
Sure it's not navy powder blue, rather than grey?
Driver of an original and worked Willys MB. Devil to purists/preservationists. Saint to real jeepers