Theft is not common, but it seems to enjoy best, biting those who try to ignore the simple Caution given us every time we have visited Bonair, starting @ 2 decades ago:
LEAVE THE WINDOWS OPEN AND LEAVE NOTHING IN THE VEHICLE.
I will note that there does not seem to be any theft value to crumpled up towels, plastic water bottle and even well worn T shirts, but that is all we leave behind us on a shore dive. Even eyeglasses, you should plan on stowing in some sort of carry case or pouch on your person as you dive.( salt water is no salter than the human skin, so they will survive submersion).
One PADI Course Director I trained with spent the last half of the week on one trip driving with his prescription dive mask on....
Even cell phones should stay behind when shore diving Bonaire. If you should get a flat, or enjoy another sort of break down, there is plenty of traffic to flag down, and ask for help.