"Call unfounded" - I wonder if that means they got a prank call or maybe someone saw some geek costume with fake gun/armor

About a year ago, a student's umbrella was mistaken for an assault rifle at the university where I work and we were on lock down for hours. http://www.wral.com/news/local/story/10387437/

When I hear college, body armor and "rifle", I think paintball.

Could be. This is Boston. Remember Aqua Teen Hunger Force?

I'd still like to know what actually happened, though.