mbam

Hi, new to this site. Any help most appreaciated. We have a DVMR-4CS. For the most part it we never pay attention to it. Knock on wood have not had a problem in 5 years. Last weekend we had a theft so of course now it is important. 2 exterior cameras, and sometime between 9:00 PM and 5:00 AM on of them was moved so as to miss the area of interest. Recording jumps from 9 to the next image at 5. Looking at the disk map shows the 2 cameras as "absent". What is absent versus video loss? Thanks!!!