Gus Lamont was last seen by his grandmother playing at the Oak Park Station homestead in outback South Australia on September 27, 2025.
Major crime detectives and specialist officers resumed a search of the property on Monday, "to take advantage of opportunities that may have arisen as a result of recent heavy rains on the property", SA Police said.
Task Force Horizon will "search numerous locations" for evidence over the next three days, police said.
On February 5, police declared the boy's disappearance a major crime and said someone living at the remote station was a suspect in the case and his likely death.
They confirmed his grandparents, his mother and his younger brother were at the property at the time he disappeared but emphasised his parents were not suspects.
The disappearance sparked intensive searches spanning almost 500sq km and involving hundreds of police and volunteers as well as aerial support and mounted units, which have failed to locate Gus or any items belonging to him.
In February, the boy's parents Josh Lamont and Jess Murray said they were united in grief, and united in the search for answers about what happened to Gus, who meant everything to them.
"Our lives have been shattered, and every moment without him is unbearable," they said.
"We know someone out there may have information. If someone knows what happened, we are pleading with that person - or anyone who may have seen or heard anything - to please come forward."
Anyone with any information on Gus' disappearance is urged to contact Crime Stoppers on 1800 333 000 or at www.crimestopperssa.com.au
