It is unfortunate that they are no longer on that campus.
I recommend contacting the university to see if they have any records of ANYTHING pertaining to the organization or some of the members whose names you remember.
I assume it was a local so there wouldn't be a larger entity to contact. (There's another Sigma Phi Nu that was founded in 1996)
"Big world. Lots going on. Many options."
"How nice of you to have all the answers and have done everything right in your life. I'm wondering if your ivory tower is lonely. But then it wouldn't be because you have the warm embrace of being better."