There is NO birth certificate to protect.
Just some afterbirth planted by a tree in Kenya.
Ask his African Grandmother.
In my fantasies, a Moussad agent posing as a Kenyan villager becomes friend and confidant to the Kenyan grandmother. Grandma spills details about time and place, possibly providing incontrovertible evidence. Agent gets her on video AND in signed affidavit.
Seriously, though, why isn’t Zero getting the hives every day of his life wondering when or if he will be exposed? I’d be sweating bullets—but that’s just me.