I wonder if the Punahou School would have a copy of his long form BC in their files.
Usually schools request a BC when a student is being enrolled.
Possibly. Also Occidental College, and maybe Columbia as well. Perhaps the state of Illinois would have a copy, since I think you need one, or a naturalization certificate to get a license to practice law. If he got a driver's license in Hawaii, there's probably a copy associated with that as well. Or if he never got a license until he moved to the mainland to attend Occidental, California might have a copy.