For what other reasons would seal these school records???
You can't be serious. Someone really lacks imagination, I see. Off the top of my head, I can think of several highly plausible reasons:
1) Bad grades.
2) Disciplinary problems that could embarass him.
3) Evidence he was a beneficiary of affirmative action.
4) By keeping them sealed, he encourages idiot conspiracy theorists like you, who then make the entire opposition look stupid.