Delco and Callie find the victim's email on computer attached to the unsecured wireless network. The email would be in the victims missing laptop, not the computer where they find it. The wireless connection is just a path to the internet, not remote control of the other computer.
Eric ask why there is no sound on the web cams. The tech replies that audio takes up too much bandwidth. In fact video takes over 100 times the bandwidth as audio. Therefore the audio for all 40 web cams would take less bandwidth than the video from one of the cameras.
An IP address consists of 4 groups of up to 3 digits, separated by dots. Also no grouping of 3 digits can be higher than 255. Yet the IP address of the errant computer is a grouping of 5, ending in 4 digits with 2 of the groupings above 255. Not possible.