Detective Superintendent Darren Fielke gave an update on the investigation after detectives and specialist officers returned to Oak Park Station this week to scour new locations.
A cadaver dog, a police helicopter, and Taskforce Horizon detectives converged on Bullyaninnie Station near Oodla Wirra in the South Australian Outback on February 16.
Officers have described the person in question as someone who lives on the remote property where the boy vanished, but stressed it is not one of his parents.
Police have finished searching remote mine shafts in South Australia's Mid North, but there is still no sign of four-year-old Gus Lamont - two months after he disappeared without a trace.