After reading the info on Peter's disappearance and then reading another case of a California teen, Gayle Marks, also missing from California; there is something in common with these two cases as I see it.
Peter's license was received weeks after his disappearance and Gayle went missing after going to DMV and her license on one site says it was mailed and received days after her disappearance. But on AMW is says that it was not received until 1989, months after her disappearance.
Gayle goes missing from San Joanquin Co. in 1988 and Peter goes missing in 1995 from Berkeley, Alameda Co. These counties are neighboring and in Gayle's case there is speculation as to whether two known and convicted serial killers are responsible for her disappearance. Wesley Howard Shermantine and Loren Joseph Herzog.
After looking at there profiles, they did kill men too.
Could there be a connection?