Clarification, Musk bought a B.A. in physics. In the Paypal S-1 in 2002, [1] Paypal's lawyers claimed that he graduated with a B.S. in Physics and B.S. in Economics in 1995.
Yet the actual degrees subpoenaed from UPenn indicate a B.A. in Physics and B.S. in Economics in 1997, two years later. He could not even remember the year he graduated or the degree he received just 5/7 years after their purported completion. I have yet to meet a single person who actually graduated from college who can not accurately recollect the year of their graduation, have you?
Most likely he did this because he was in the USA on a student visa and dropping out of UPenn in 1995 made him a illegal immigrant which his brother, Kimbal Musk, corroborated in a interview [2].
[1] https://www.sec.gov/Archives/edgar/data/1103415/000091205702...
[2] https://www.reddit.com/r/EnoughMuskSpam/comments/1az29vs/elo...