Did these vehicles simply vanish off the face of the Earth?

The black pickup truck.

The small, not well kept car.

The white van.

The medium sized car, described as clean and shiny, that left the crime scene at high speed.

All of these vehicles must have been mentioned in police interviews.
Were none of them ever found?
Were any of them ever seen again?
Were any of the people connected with these vehicles interviewed by investigators?