The children have not been seen since December 2021, when Phillips took them to an unknown location, thought to be in the King Country or Waitomo district.
Since announcing the reward, police stationed officers on the ground in the tiny coastal community of Marokopa for 24 hours a day, for the first three days.
Now they have scaled back their operation to a small team of investigators and an assurance patrol but say the presence, including checkpoints at four locations around the isolated settlement, has fielded good leads.
Saunders said the mum was pleased with the reward announcement.
It includes possible immunity from prosecution for anyone who may have committed an offence in assisting Phillips in the past, but who now gives information leading to the children’s return.
Like many others in the community, she wanted to see her children returned safely.
Saunders said although police scaled back their presence in Marokopa on Friday - where they had been since Tuesday - a smaller team would remain until the reward offer expired on June 25.
“After three days of this phase of the operation we’ve had over 70 new reports of information on the subject of the missing people, via phonecall, email and personal approaches offering information.
“We’re continuing to assess the information and conduct follow-up enquiries.
“As a result of our enquiries we have identified a number of credible reports that are being investigated further.”
Saunders said he could not provide details while the investigation was ongoing, but police were committed to getting a result as soon as possible.
He told RNZ while Marokopa continued to be a focus for the investigation, enquiries were also being carried-out in surrounding areas including Honikiwi Rd, near Ōtorohanga.
“We’re appealing for anyone who has observed suspicious behaviour in these areas in recent months to please contact police.
“Our message hasn’t changed: We continue to urge anyone with credible, current information that will lead to location and safe return of Ember, Maverick and Jayda to the right thing and tell Police what you know.”