The former lead investigator into the disappearance of NSW boy William Tyrrell believes South Australian police have learnt lessons from the high-profile case in their search for four-year-old Gus Lamont.

Augustus “Gus” Lamont was last seen playing on a mound of dirt at his family’s remote sheep station in South Australia’s east about 5pm on September 27.

The boy was reportedly left alone for half an hour before his grandmother tried to call him inside, only to find him missing.

The family spent three hours searching the property before calling police.

State emergency services, helicopters and Aboriginal trackers then joined the search, which covered the sprawling 24,000-hectare property about 300 kilometres north of Adelaide. Despite an exhaustive search lasting 10 days, no trace of

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