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AURORA, Colo. -- Police have finished collecting evidence from the apartment where the Colorado shooting suspect lived, but residents are still not allowed back into the building because of chemical hazards.

Aurora police said Sunday residents can retrieve personal items, but the building remains closed. Police don't yet know when the residents will be allowed to go home.

Investigators say they found a complicated array of booby-trapped explosives in the third-floor apartment where 24-year-old James Holmes lived. It took bomb experts hours to dismantle and dispose of the material.

A law enforcement official says investigatorsalso found a Batman mask inside the apartment.

Aurora Police Chief Dan Oates says it could take months to determine a motive and police are working with FBI behavioral analysts.Oates saysHolmes has "lawyered up" and is not talking.

Holmes has been appointed a public defender and is scheduled to make an initial court appearance on Monday.

The police chief says Holmes had more than 50 commercial packages delivered to his home and school address during the past four months.

Holmes is suspected of opening fire on a packed movie theater early Friday, killing 12 people and injuring 58.

Police say the theater will remain closed as a crime scene for up to a week.

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