The IBM laptop used by Cooper had a lot of software on it that was set to update, download updates, run security scans, and various other things, all automatically, without the user doing anything. Pretty standard stuff in corporate environments. The files changed on Cooper's IBM computer were the result of scripts running on that computer, not by anyone in the police dept accessing anything. Testimony already showed that no one touched his computers to access anything before the computers were handed off to the FBI. The computers were in a secure and locked room, with the keys given to only 3 people in the entire dept, and none of the lead or other first tier detectives had the key to this room. From the time investigators entered the Cooper home on July 15 to conduct the search / search warrant to the time Detective Ice removed the power cord and battery from the laptop, as was their policy, no one touched the Cooper's computers.