Zullo discussed that in detail recently and possibly also at the big presser when the forgery of the draft registration was revealed, IIRC. I think he discussed verifying that entering the number in the selective service system returns Barack H. Obama.
My memory is recalling that now. Zullo did mention the bogus Selective Service document in his presser being fraudulent.
There is a bogas draft registration gotten thru FoI. It had an extra diget.
Just make certain they know all you’ve dug up.