Has the RCMP investigated the possibility that he might be Edward Nemanishen? He shares many similarities with Sam. His hair, height, weight, and age all check out. He worked in the construction industry, something investigators speculated that Sam might have worked in. Only inconsistently from what I can tell is that he went missing 4 years prior to Sam's remains being found.
The Doe Network: Case File 4293DMSK
The Doe Network: Case File 4293DMSK