When more than half of the schools in the circ area are 2A or below, there are NO pressboxes. Not really a choice of how I cover a game.
As far as access goes, while the principal or AD or whatever can try to "ban" you from a box, etc., if it's a public school, they can't deny you entry. They may make you pay, but they can't turn you away. You can still do your job, even if it's not by your preferred method.
If someone is hindering you from doing your job, the biggest "fork you" is to do it regardless of the situation. Don't give in and get all pissy.
Just do the job, it's all that matters.
(If it's a private school and they throw you out, you're forked.)