Times were way different back then.....Men were trusted do their "duty" to file where they lived. I have seen cards filled out where they reported working but their "Home" county draft board were sent the card to stamp and keep. The men also were trusted to fill out correctly as this was a civilian registration by a local draft board were the members of the board could have known all the men of the ages required to file in the area they covered. I would also think others in the community would ask or know whether a man filed or not.
I have seen various cards that don't match birth days, birth months or birth years as other records had later for the same men. Not all men were drafted, some volunteered, some were disqualified by job, family, health if they were conscripted.
Does he have a WWII Draft Registration Card filed 1942...Known as
the old man's draft.
This website is also informative.
http://www.eogen.com/USWorldWarIDraftRegistrations