Police are trying to piece together how human remains may have gone unnoticed for years near a frequently-used Hunter four-wheel-drive route.
Bones, believed to be that of missing man Danny See, were discovered in bush land on Saturday, March 11.
Mr See was reported missing in February 2015.
Central Hunter crime manager Detective Inspector George Radmore said in the area the remains were found there was a frequently used four-wheel-drive route.
The remains were discovered scattered over a small area of bush land under the Wallambang Bridge on the Hunter Expressway at Seahampton.
The coroner conducted a post-mortem last Wednesday, which Detective Inspector Radmore said “may shed further light on the cause of death”.
He also said police should be able to formally confirm the identity of the body through forensic testing.
Detective Inspector Radmore said police still needed more assistance to solve the case.
“Without further information there’s not much further we can go,” he said.
Central Hunter police led a thorough investigation into Mr See’s disappearance when he was reported missing.
Mr See, who was 43-years-old at the time of his disappearance, lived alone but made regular contact with family members.
The last contact Mr See made with family was in early January 2015, and he was not heard from again.
His bank accounts had not been touched since December 2014 and there was no record of his mobile phone being used since January 2015.
Mr See did not own a vehicle, but police thought he may have been hitch-hiking in the region.
He was known to frequent the Maitland, Cessnock, Singleton and Muswellbrook areas.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or online at https://nsw.crimestoppers.com.au/.