Another item has been discovered and will be forensically tested in the ongoing search for the remains of William Tyrrell.

On Saturday, police scouring bushland in Kendall uncovered a green hessian bag and tagged it as evidence.

It was inspected by specialists at the scene.

That follows police finding a piece of light blue material on Friday, placing it in a brown paper bag and sending it to Sydney for forensic testing.

The items’ significance in the investigation has not yet been determined.

It comes as investigators close in on the end of the first week of the renewed search for William’s remains.

The “high intensity” search was first announced on Monday.

However, in the six days since, police estimate they have searched only 10 to 20 per cent of the areas of interest - about one square kilometre.

At that rate, the painstaking search could be drawn out for as long as nine weeks.

So far, police have combed bushland and drained a creek in an area about one kilometre from the Kendall property where the boy’s foster grandmother lived, and where he was seen more than seven years ago.

Investigators have also scanned a concrete slab at the property, laid after the boy disappeared, but have since confirmed nothing of note was found.

The findings of a coronial inquest into William’s disappearance, which concluded last year, are yet to be handed down.

A $1 million reward for information on the case still stands.

- with AAP