Saunders said information continued to come through daily including alleged sightings, suspicious activity and certain types of offences that had happened in the area of interest.
“We’ve got some good follow-ups to do but that might take a number of weeks.”
Investigators were still hoping to hear from the people they believe are helping the family stay hidden, he said.
The reward was deliberately set for two weeks to target those people.
“If they’re not going to come forward in that two weeks they’re probably never going to come forward.
“Once the reward is finished we’ve still got a considerable amount of work and inquiries to continue with.”
Saunders said a letter released on social media by the children’s mother was of no interest to the investigation as it was received well before they went missing.
But her appeals to the public, along with the reward offer, had “reignited” the public response.
“With a steady flow of information, that’s what’s always helpful to us.”
- RNZ