That's despicable. Years ago our band had all our gear nicked from the back of a van. I lost a beautiful, perfectly setup 78 Precision (in an unusual Antigua colour) and a 200w Marshall head and 4 x 12...and we weren't insured!, so I know how they'll all be feeling.
We didn't have all this online media stuff in those days so we had no chance of getting the stuff back but hopefully someone from this forum or their contacts might spot something. Would be handy if you could give us the serial numbers to look out for.
Hope they get their gear back and the vile scum get caught.