Officials at the University of Colorado say two suspicious packages received Monday at the Anschutz medical campus in Aurora were found to be harmless.The first package arrived early in the morning and was slipped under the door at Building 500, the former Fitzsimons Army Hospital, officials said. The building was mostly empty when the package arrived, and people were not allowed inside until the package was determined not to be a threat at 11:34 a.m., officials said.The second package was addressed to a person at the Facilities Services Building and came from the school's central mail facility, officials said.The building was evacuated at 12:26 p.m. and employees were cleared to return at 3:06 p.m.University officials declined to comment when asked if the packages had any connection to James Holmes, the man accused of killing 12 people in an Aurora movie theater. Holmes had attended the University of Colorado at Denver and was studying at the medical campus. Holmes recently withdrew from the university's Ph.D. neuroscience program.The Anschutz medical campus is on heightened alert after the shooting.The university has said it's investigating whether Holmes used his position as a graduate student to order materials in the potentially deadly booby traps that police say they found in his apartment.Police said Holmes received deliveries over four months to his home and school. They haven't identified the contents.University spokeswoman Jacque Montgomery said Sunday that the school is looking into those packages received at the school.At a Monday news briefing, university officials said they had completed an initial inventory of chemicals at the medical school and did not find anything missing. But they are now doing a more in-depth inventory. Officials said students in Holmes' former program did have access to chemicals.Official would not say whether Holmes checked out any chemicals, citing the need to protect the ongoing investigation.University officials said Holmes did not give a reason for why he was leaving the program in his withdrawal forms. There were only six slots for the "best and the brightest" in the program, and Holmes was one of them, officials said. They called him a very academically gifted student.Despite news reports that Holmes was kicked out of university housing, university officials said his Aurora apartment was not part of university housing.University officials would not talk about Holmes' mental state.Police said Holmes opened fire in a theater during a packed midnight showing of the new Batman movie early Friday, killing 12 and injuring 58. It took hours for bomb experts to dismantle a complicated web of trip wires and explosives inside his apartment.