Have a look at Samsung smart things, it's not an alarm but you can get it to do things like flash the house lights, turn on web cams etc. You set rules, so you could say that if a motion sensor is tripped between 8am and 5pm Monday to Friday then turn on all the lights and record. Obviously you have to go to town with add on bits but you might get a picture of them.
I don't know if you can but if you put up the chassis number it might help someone avoid buying it. We occasionally buy them and love them, the r8 ... Give me a c63 any day.