According to the Sydney Morning Herald, the police think the bones they found out in the bush in the Hornsby area are those of Aubrey John Joseph Neilson, who was reported missing in September 1961. He was 51 years old at the time. In addition to bones and bits of clothing, they also found a rifle at the scene and some coins dating between the 1940s and 1960s. The area where the bones were found has been built up, but it was an isolated place back when Neilson disappeared.
I wonder if he has any family left to bury him.