Board Thread:False Info and Speculative Discussion/@comment-25550807-20141104043221/@comment-4091815-20150228025900

Season 2, Episode 5 "Reptile Boy"

Buffy and Cordelia go to a college frat party that is cover for a cult that sacrifices high school girls (virgins) to a giant snake.

So there was a college in Sunnydale (over the Hellmouth) since Episode 17.