Major crime detectives and specialist officers have spent the past three days combing Oak Park Station in the state's outback, returning to the property in the hope downpours exposed new evidence.
Officers from Task Force Horizon began the latest search on Monday, targeting numerous locations across the vast station, including areas where rain and erosion could have shifted soil or cleared vegetation.
"Unfortunately, we have not uncovered any further evidence that helps us locate Gus," Detective Superintendent Darren Fielke said on Thursday.
"Task Force Horizon members on the property, together with STAR Group officers — up to 17 people over the past three days — have searched all of these areas in an effort to uncover new evidence or information that might help us locate Gus.
"They have walked and searched more than 30 kilometres of waterways."
Gus was last seen by his grandmother playing at the Oak Park Station homestead on September 27, 2025.
On February 5, police declared his disappearance a major crime and said they believed someone living at the remote station was a suspect in the case and in the child's likely death.
At the time, officers confirmed his grandparents, his mother and his younger brother were all at Oak Park when Gus vanished, but stressed his parents, Josh Lamont and Jess Murray, were not suspects.
The four-year-old's disappearance sparked a massive search across almost 500 square kilometres, drawing in hundreds of police and volunteers, along with aerial support and mounted units.
In a public plea in February, his parents said they were united in grief and in their search for answers about what happened to their son, 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."
Gus's grandparents, Josie and Shannon Murray, also released a brief statement through their lawyers saying they were "absolutely devastated" by police comments that someone at the station was a suspect.
Investigators had previously searched the station homestead on January 14 and 15, seizing a vehicle, a motorcycle and electronic devices for forensic testing.
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