The first police officer to respond to William Tyrrell's disappearance says his investigation included information that someone had asked for the way to the boy's foster grandmother's street.
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It is the fourth day of the coronial inquest before NSW Deputy State Coroner Harriet Graham into the boy's disappearance.
It is hoped all the evidence collected by Strike Force Rosann, the police unit leading the Tyrrell investigation, will be heard and tested at this inquest and conclude that William was taken as a result of human intervention, and not misadventure.
Three-year-old William vanished while playing in the garden of the Kendall property on September 12 in 2014.
Senior Constable Christopher Rowley arrived at 11.06am, 10 minutes after William's foster mother frantically called police to report him missing.
He testified on Thursday at the inquest into William's disappearance and suspected death which is being held at the NSW Coroners Court.
Counsel assisting the coroner, Gerard Craddock SC, asked: "(You) canvassed local businesses to see if anyone expressed any interest in Benaroon Drive, and I think you identified at a cafe a person who could recall someone asking for directions?"
"Yes," the officer replied.
The inquest so far:
Sen Const Rowley searched the family property when he got to the scene and asked another officer to do the same when he arrived.
His initial search did not include the roof space or the garage.
"I would've tried to do it but it was either locked or too heavy for a young child to lift himself," the senior constable said.
He told the inquest there was a large amount of thick lantana opposite William's foster grandmother's house.
"The young fella wouldn't have (gotten in there). Especially wearing a little nylon Spiderman suit, it would've been like Br'er Rabbit," he said, citing the Uncle Remus folk tale in which the rabbit becomes increasingly stuck as he fights a "Tar Baby".
William's biological parents are the final two witnesses due to front the inquest on Thursday afternoon.
The mother and father "were in a difficult relationship" and issues brought them to the attention of the Department of Family and Community Services, Mr Craddock said on Monday.
William was a baby when he was placed into foster care in early 2012.
The inquest continues before Deputy State Coroner Harriet Grahame.
