31B is generally part of the opposing fans section
There are no sections specifically for students for the Troy game, (or YSU or Ohio) because those games aren't part of the student ticket package this year (students still have the option of buying tickets for those games but the games take place before the students are officially on campus).
During the Student ticket package season their will be 2 "Block O" sections specifically for students, 39A and I believe 1A/2A (just starting to put them back on the north this year)
A couple things
#1 Yea it depends on what gate you happen to go in as far as how strict they are in checking Buck ID's
#2 It does not matter if you use your OWN buck id or not, ala students are allowed to give their buck id to the person who has their ticket to allow them to get in with that (the theory being that they will only give their id out to someone like a family member who can use their ticket). The catch to that being that they do not actually scan the ID, I personally have a couple of old deactivated Buck ID's laying around because I always find them the second after I get a new one.
That being said I doubt they are student tickets as thats generally an opposing fan section, but it can never hurt to ask I guess