sounds like it wasnt a random robbery... Someone had to of known where you live, what type of car you have, and all. Something seems a little fishy and why were the other car batterys d/c'ed ??? that seems odd. and please dont let a friend do an alarm installation. get it professionally done next time.. Alarms are one thing id have the professionals do. Better to be safe then sorry. Use this as a learning experience... Feel sorry for your loss.