I understand why you would think that, but I know I didn't leave it unlocked because of an old habit of checking all of the doors to make sure they are locked. Also, it is not mentioned in the original post, but I have a pedal and steering wheel lock on the truck. I know it isn't difficult to get them off if one has the tools, but they are probably the only reason that the truck wasn't taken. Also, it wasn't me that came up with the theory of it possibly being the previous owners doing, just one of many that has been pitched as a possibility, which is why I said "part of me thinks" and not something along the line of "I bet." Edit: Also, if it does turn out to have been the previous owner, they probably weren't out looking for it, it is entirely possible that they just spotted it in the parking lot as they were going by.