Sorry to hear that mate, sounds like you're definately bein targeted lets hope someone eventually catches the barstewardss and gives them what they deserve
We own a construction company and our sites get broken into a lot, vans get nicked and plenty of tools, in fact one site got done on saturday night about £5000 worth of damage and stolen gear etc police just don't want to know...complete waste of space when it comes to catching people especially when pikey scum are involved...theres your crime no. claim from your insurance is all we get from them.
You thought about upgrading the alarm to one a bit louder than you can hear? Or parking the car somewhere a bit safer if possible?
Hope you get things sorted and that it doesn't happen again.