I'm sorry, but, have all of you people just recently moved out of a cave or something. The cars in Disney are not for sale. It wouldn't surprise me if they didn't even have an engine in them. They are for display. People with clipboards are there to answer questions about the cars themselves and to take information so that you can eventually make contact with a place that really can sell you a car.
For your safety... Well, just off the top of my head there has been some wild rumors floating around the we, as a planet, have been having some, minor, problems with terrorists organizations. People on rides at Disney can and do carry backpacks, bags and more. It would be a great idea to just have the trunks open up where something could be left off in it and the person just walk away wouldn't it.
If the OP didn't post this as a joke... then there is something seriously wrong with them.