HOUSTON -- New clues found in the vehicle of a missing Rice University student are making investigators wonder whether he wants to be found, KPRC Local 2 reported Wednesday.

Matthew Wilson, 20, has been missing since December. Police in Berkley, Calif., found his vehicle parked on a residential street in June. Investigators said they found books and notes on how to assume a new identity inside the car.

Since his disappearance, Wilson's friends and family have been going door to door passing out fliers, hoping someone has seen him. The computer science major was last seen at his off-campus apartment and school officials said they became concerned when Wilson failed to turn in any of his final schoolwork.

His family created a Web site to help with the investigation. They blog about any new information released by detectives and how they are holding up.

Rice University police said the only things that appeared to be missing from Wilson's apartment were his backpack and his car.

Wilson is white, 5 feet 7 inches tall, 135 pounds and has red hair, a full beard, green eyes and wears glasses.

A $25,000 reward is being offered for any information leading to his whereabouts. Anyone with information is asked to call Crime Stoppers at 713-222-TIPS or Rice University police at 713-348-6000.