Police have returned to the remote South Australian property where a four-year-old boy vanished hours after officers called off the large-scale search for him .

Gus is believed to have wandered from the property, which is about 40km south of Yunta, about 5pm last Saturday.

An extensive search has been ongoing after his family were unable to find him and has grown more desperate each day.

Yesterday Assistant Commissioner Ian Parrott announced that police would scale back what he described as "one of the largest, most intensive searches" for a missing person in the state in recent times.

Police returned to the family's property to investigate what is now the presumed death of the four-year-old boy.

Officer spent more than two hours speaking with family and taking pho

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