50 years ago, one of my jobs was to locate gravel in the East Kimberley Region. We were to extend the bitumen road from Hall's Creek towards Fitzroy Crossing and I was sent to locate gravel deposits. I was driving over low spinifex hills about 4 km off the Great Northern Hwy and came across a Valiant car. The doors were open, the key was in place and everything was in place...except for tyre tracks and footprints. I called up the Main Roads camp, who called the Hall's Creek police. The police officer came out some hours later and suggested that a group of Aboriginals were trying to get to one of the Missions and took a shortcut and ran out of fuel, or the motor conked out. As for no tracks, it must have been abandoned a few years earlier.
Never heard any more about it.