^^^^ Oshawa would be a good start. Its not hard to trace public records. Not even for an amateur.
Police can access an awful lot of information just from your drivers license/medical records.
But none of us are the police so we can't access drivers licence/medical records or tax records. We have to depend on open source searches. Virtually all of the information that is available from the 70's that pertain to records is on microfiche. Plus we don't know what city he lived in. Did he use his name or were things under his wife's (girlfriend?) name. Every single professional researcher or PI working for the media is striking out on finding this guys whereabouts.
Not one of his friends or anybody that worked with the guy have spoken out about that time period short of he worked for Eaton's. Do you think this sounds like a guy who flew so under the radar he only showed up on the police radar over the last 18 years? I think we're going to hear a whole lot more about problems or bizarre behaviour from his over the 70's, 80's and 90's.