Campus police said 19-year-old Luke Caparelli posted the note on the social-networking page on Jan. 13.
The note was written in third person and included a threat that Caparelli would have an Uzi submachine gun "locked and loaded in his bag."
A detective's affidavit made public Thursday said police apparently did not find any weapons when they searched Caparelli's bags and dorm room on Jan. 14.
The affidavit said Caparelli acknowledged writing the statements but said he wouldn't do anything to harm anyone on campus or hurt the school. Caparelli has not responded to requests for comment.
District Attorney Tom Keith said his office is awaiting reports from campus police before deciding whether to file any charges.
