In environmental consulting, sometimes you work in dicey areas. If you do so, you’re usually hyper-aware of your equipment and keep a close eye on it. I never had anything stolen in that situation.
But if you’re working in the middle of nowhere, or you run out for a couple of minutes…that’s when you’re likely to lose something.
I’ve had various items stolen from job sites, with costs ranging from less than $10 (the odd screwdriver) to thousands of dollars (sampling/analytical equipment ain’t cheap). The worst experience, however, was when the drillers came back from lunch on a cold winter Monday to find that their duffels and suitcases stuffed with jackets, pants, spare boots, and all sorts of personal items had been taken. They were not happy.