Darn, thought I'd already commented.
Looks like a cul-de-sac, so a good chance the thieves had been visiting or been tipped off by someone there - have you tried showing a picture of the ute to the people living/working there - with careful observation of their response?
The other thing is there is a good chance it will turn up on Trade-me, or similar, so keep an eye out on those.
I hate thieves, best thing for them is 6 feet of dirt!