By now , VICPOL would know Stephensons entire history, from when he cracked his first tooth, his graduation from kindy, his primary school antics, his secondary school career, his weekend pursuits, his weekday habits and routines, his friends, his enemies, his peers, his colleagues, his hobbies, his travels, his tracks around Ballarat, Victoria, NSW, Bali , wherever, what he ate, where he ate, where he drank, his day to day activities, from the moment he woke up. Nothing remains a secret when you are suspected of murder.
Electronically, his entire life would be exposed. Who he contacted, who contacted him, for years....
Whatever associations, or groups he belonged to would be , by now, under a microscope, investigated into the ground, run thru the mill of all law enforcement orgs , throughout AU, because stranger/stranger murders are a great disturbance to public safety, nothing is left to chance as far as possible. Any 'guru', or 'leader', or 'mastermind' would be 'helping the police with their enquiries' by now..