On Tuesday, students from the school revealed that they found documents related to the agreement in a dumpster behind an administration building on campus.
A university vice president told ABC News that she believes a version of the agreement made public by university students Tuesday may have been stolen.
"We believe, and campus police are investigating, that someone broke into my office and stole the document from my recycling bin," Susana Gajic-Bruyea said in an email to ABC News.
The attorney general's office pledged to get to the bottom of the situation, saying its expanded inquiry will seek to determine whether the university foundation, which has assets of more than $20 million, is spending its money to benefit the campus, as it promises donors, the university and the public.
"We are taking this action to make sure that the money raised goes toward the intended educational purposes and not a dollar is wasted or misspent," Brown said. "Prudent financial stewardship is crucial at a time in which universities face vastly decreased funding and increased student fees."