There is no “box” to check regarding legacy status. There is a question on the applications which requires you to indicate what your parents level of education is, and where they attended. (Same for your siblings.) Unless you mislead the college by providing false information, theres no way to conceal your legacy status in any honest, passive way.
As far as the title subject, I’d be very surprised if every large state university didn’t have some procedure in place to handle application inquiries from people who have direct influence over it. I’ll also note that in several of the instances examined in the report, they indicate that “diversity” considerations came in to play in more than half of them.