Did you have to provide a copy of your birth certificate in order to enroll?
Shoot I had to have a physical before I could enroll in a state school in 1968, so I'm pretty sure they needed a birth certificate as well. Also some proof my parents were residents of the state, since in state tuition was cheaper, a lot, but required proof of the parents residency, or proof that the student was a resident and self supporting for an entire year prior to enrolling and/or attending. (State Supreme Court eventually struck that down, saying that the state couldn't have one test for instate tuition and another for everything else that required residency in the state.)
Not that we had many out of state students, other than foreign students and athletes. In some sports not even many of those.
It was a long time ago but I don’t think I needed to supply a BC to enroll at Oxy. If they wanted to check my identity they would have asked for my drivers license.
It might have been necessary to supply copies of the visa or passport for foreign students. That would make sense since they would not want someone enrolling who was an illegal. They might have his passport copy or visa documents on file.