Believe it or not this happened, driver left wagon door open (to listen to 2 way radio he said) was in his company yrd, He was changing a bulb at Ns rear o trailer another driver took key out ignition ( engine was stopped) shut and locked the door and went into office to hand over keys aNd grass driver up for leaving door open and keys in ignition.! Petty beyond belief. Meant to say he walked past the driver taking the screws out to change bulb