Just because a company says they are not responsible for what happens on their parking lots doesn't necessarily mean it's so. In MI, when you are parked in a private lot, say for a concert, the stub has (or had) printing on the back with a disclaimer for damage. My car was vandalized and I made it a point to obtain names and got descriptions of the people working at the garage. My insurance company went after the lot owner. Now the burden of proof is a lot harder when you use a lot where everyone is gone at the end of an event. In Ford's case I would file a motion. That said, if they aren't responsible for your vehicle then they have no right to search it (IMHO). The out here is that some facilities (Chrysler for instance) have lots where the employee has to badge in and out of the lot. Here at Local 600 I was told, years ago after having two cars stolen in one year, that the union didn't want to have locked down lots because it could make life "Not so fun" for some people. Meaning: everyone has to risk having their personal property stolen for the benefit of a few.