Four Missing People and Two Unidentified Bodies: What happened to Pinky Redman and Mike Griffin?

In 1958, teenage lovers Pinky Redman and Mike Griffin set off on a road trip to Las Vegas to possibly elope, but they were never seen again. And they weren't the only ones to go missing. Six months later the boy of a teenage girl was found in the Arizona desert. Was this Pinky? Was this someone else entirely? What was happening in Arizona?