Police say it's "encouraging" to still be receiving tips on autistic man Nigel Peterson who went missing in the Bay of Plenty over a month ago.
The Behaviour Science Unit is assisting to "build a better understanding" of Mr Peterson and his movements around the time he went missing.
It's been reported that he was affected by a change in his accommodation location and took off from a caregiver.
His family told Newshub in November there's a chance he's trying to reach family in Whakatane - but believed it more likely he was hiding somewhere, too distressed to come out.
"He actually doesn't approach strangers very well and wouldn't talk or seek help," his father Chris Peterson told Newshub.
"He's a really nice boy, he has good manners he knows how to do everything right," said Nigel's mother Ilene Goldsmith.
Nigel takes regular medication and it's not known how long he can go without it.
More than 1000 private properties have been searched, and anyone who may have seen Mr Peterson is urged to take the time to record as much detail as possible.
Volunteers, friends and family are still searching.
Anyone who sees Mr Peterson is asked to call 111. Police ask anyone with "historic" information to call Rotorua police on (07) 3480099.