> In the future I'm going to add a local battery backed alarm

Wait, you have an office full of expensive equipment but decided to half-ass DIY the security? No wonder you were targeted.

A proper monitored alarm system would have prevented this. They pretty much all have built-in cellular backup now. Do yourself a favor next time and call a professional.

Don't blow your entire budget on cameras then wonder if you need an alarm system because the only good the cameras will serve is to watch your stuff disappear. You mentioned California so expect these guys to be roaming free in short order if they see any jail time at all. Good luck with seeing any restitution or getting your stuff back.