A renewed search for the remains of missing toddler William Tyrrell are expected to wrap up at Kendall in northern NSW in coming days.
The forensic search, which is being conducted under a Coronial Order as part of ongoing investigations into the disappearance of William Tyrrell, has been ongoing since November 15.
Once the search operation is complete, a team will facilitate a repatriation of the site.
Further, forensic examinations of seized items and a significant quantity of soil remain ongoing.
Police with Strike Force Rosann, specialist forensic experts and the Australian Federal Police joined forces again to look for any clues to solve the seven-year mystery around William Tyrrell's disappearance from his grandmother's yard in Kendall on September 12, 2014.
Wearing a Spiderman suit and playing with his sister in the moments before he vanished, there has not been one solid piece of evidence to suggest how the boy disappeared - or who did it.
He was just three-years-old.
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The five week search at Kendall was on the assumption teams were looking for Tyrrell's remains.
It has long been Strike Force Rosann's belief the boy disappeared as a result of human intervention.
The focus of the investigation zeroed in on the former foster grandmother's Benaroon Drive property; a car formerly owned by the late foster grandmother; and a one kilometre radius of bushland off Batar Creek and Cobb and Co Roads in Kendall.
Excavations were conducted underneath the balcony at the Benaroon Drive property where William was last seen, with one theory suggesting he may have fallen and his body was taken elsewhere.
Cadaver dogs have also been used at the three locations of interest.
NSW RFS volunteers assisted police in clearing dense bushland.
The creek that runs through the search site has also been drained with geomorphologist Professor Jon Olley, who played a role in the discovery of murdered child Daniel Morcombe's remains in 2011, advising police on site.
Prof Olley told the Daily Telegraph last week that bones of a child would likely break down in the soil that is currently being searched.
Rain over the last two weeks has hampered search progress but dozens of items, including a piece of blue fabric and red fabric, found in the soil and creek bed have been bagged and sent off for forensic testing..
"The one thing we have going in our favour is the fact that (investigators) believe he was in a polyester suit. That doesn't break down and it's very resistant to actually fading as well," he said.
"There possibly would be bones, but given the level of bioactivity here, and the amount of humic acids that are in the soils, that would actually help break them down over time."
At this stage the search is expected to last at least another two weeks.
NSW Police State Crime Commander, Assistant Commissioner Stuart Smith, told 2GB last week the search was to ensure that at the conclusion of the investigation they can say no stone has been left unturned.
"Anything found in these areas is then processed through Newcastle and then it's sent to the Forensic and Analytical Science Service in Sydney. They are working around the clock to process anything that comes from the scene."
Deputy State Coroner Harriet Grahame has been appraised, and Strike Force Rosann detectives continue to prepare a brief for the information of the Coroner.
"Investigators would like to thank the NSW Rural Fire Service, Salvation Army, and the local community for their hospitality and assistance," a NSW Police spokesperson said.
"The NSW Police Force remains committed to finding William Tyrrell and investigations by the Homicide Squad's Strike Force Rosann are ongoing."