I wonder what happened with the investigation John Doe was leading?
Just my humble opinion, but unless you're a P.I. or press, the likelihood BPD would discuss an open case with a member of the public who isn't related to the family is slim to none.
Over 21 years since the story broke, and a few things to expand on:
* In regards to the "bookstore mystery" which probably still intrigues people, I view it the same way as a parent who says they're going to a store "around the corner" to buy milk, never to be seen or heard from again. This was a real-life incident involving long-time family friends, and the story had an interesting twist: the couple were going through bitter, drawn-out marital difficulties before the husband walked out. While it's still open-ended as to what happened, the disappearance probably DID NOT involve a convenience store purchase (especially if there were no witnesses).
* I could be mistaken, but I'm nearly certain McColl's sister mentioned on this thread that the bus girl from Telegraph ("Nicole") had no idea who Peter was. For those unfamiliar with 'Telie', the squatter kids are coarse and undomesticated in their lifestyle and ways. Any business with pedestrians, for the most part, is limited to begging. The people Peter talked to were presumably hawkers of beads, buttons and t-shirts; same street attitudes, but older and warmer with strangers. It's doubtful they had any knowledge of what happened and if Nicole had a rendezvous in southern California, it was amongst people in her world ... no evidence Peter was one of them. Beyond a brief sidewalk interaction, you'd have to go out of your way to closely associate with someone like that.
* It pains me to recount on this story (as it might also reveal my identity) but before finishing school in the Bay Area, I struck up a conversation with another student. He was a year behind me and I later discovered he was the nephew of my dad's late college roommate (the boy's uncle, a semi-famous oil painter, drowned while vacationing in Australia). The lad was bright and introspective but struggled to hide a melancholy streak; his home life was unstable and he was often targeted by schoolyard aggressors. Then, during the first month of my last school year, his lifeless body was found floating off Kirby Cove.
The most shocking part of the news was other student's reactions: many speculated he probably got "high" and slipped into the water. I remembered the strange coincidence involving his uncle and briefly went into "tin foil hat" mode. But eschew the conspiracies and connect the crime scene with all the facts preceding his death, and the remaining possibility may not be a happy one, but denial is more about not wanting to accept the same tragedy if it happened to a loved one of your own.
Try this angle: What if a body was never discovered? Before the student left, he just told his siblings he was going to the mall arcade, but didn't take any money with him, and left his asthma inhaler at home? Even if I didn't know the peer in the capacity I explained, his disappearance still wouldn't puzzle me.