Jim, perhaps you may blowing things out of proportion a bit. Maybe a bit of fear-mongering to be talking about 'inside jobs'! This is bread and butter cctv stuff, not Oceans 11!.
The great majority of hoodlums and b&e types aren't gonna think to look stuff up on the internet to see how the main breaker is wired to the switch or use google earth or read the Engenius manual to find the where the reset button or any of that crap, Sheesh! Unless they are storing gold it doesn't have to be Fort Knox.
You say the customer probably knows that at least some of his details are in google, why not leave it at that?
Maybe the installer gave him a deal on the system asked for a customer reference in return for what the installer knows in his heart is at best is a slightly elevated risk of incidence. Or maybe parts of it are made up to trip up the would be internet theives. Had you considered that possibility? But you do need to consider the fact that installers need to do marketing like anybody else and so just like you can't do a job for no pay, likewise you shouldn't have to do a job without PR. Its about putting food on everybodys table.
Hope I didn't seem to harsh, if I did its probably just because I just ended a 10hr shift myself. Good points though, Jim.