I've seen a couple of people mention the DVR today, so just going to briefly restate my theory (from a technical background).
A security DVR is typically a beefy rack-mount component, like a heavy VCR. If DM didn't start doing damage control until the last minute, which it sounds like he didn't ,then it may have been too late for throwing it in the incinerator or something like that. He probably ripped out the cables, and handed it to CN intending to have her destroy it later (although I'm not sure how she could have destroyed it. See: large beefy piece of equipment). Unless he wanted to keep it for blackmail, but seems unlikely.
Meanwhile, a typical security DVR writes to harddrives, which take some doing to physically destroy or overwrite. If one had time *and the login credentials for the DVR system*, you could probably wipe the footage. But I don't think DM thought of this until it was far too late, and may have not had the login info on hand (unless he was a creeper who regularly liked watching his own security cameras/employees). (Whenever I've had to review footage from my office's security DVR it's always made me feel creepy, watching my coworkers on tape.).
Yes I think he intended to wipe the footage and reinstall the DVR back at the hangar. He just had to make sure it was out of there until it was wiped in case LE came a knocking with a warrant. He's frugal you know. I truly think he figured if LE showed up due to AJ telling them about the truck, he'd have nothing there for them to see. He probably didn't think they'd arrest him so quickly after they showed up though. He probably thought he still had a couple of days to move stuff around. He didn't know that they were already closing in on him and had enough info for an arrest when they came to see him on the 10th.
MOO