Does the van have caged windows and a cage splitter between the back of the van and the front seats? Would be a good idea in the future to install something like that.
I used to be a refridgeration engineer and heard stories about 1000's of pounds worth of tools being taken from vans and it's enough to piss any one off. The thieves know that the owner NEEDS them, but the thick bast**ds don't care what so ever and think they can get away with it, which is what frustrates me more so when I hear about it.