I'm just going back over the video filmed by the news crew on the 14th as the press conference was asking about 'abandoned vehicle'. Right at the beginning of the video, there is a white pickup truck parked in the centre of the two highways up on the dirt turnout. Easy access back onto the highway. And, easy access to the trail & bridge.
At 3 minutes 40 seconds in, there is a view of a silver (car, I think) sitting next to the building that has now been torn down. I'm unsure what vehicle the police were interested in, but they are the only two that seem out of place to me. IMO.