“We are working hard to piece together what happened to Mr Mills in the lead-up to his disappearance,” he said.
Smith thanked members of the community who had already come forward with information.
“We have investigators reviewing the information provided by the community so far, and we continue to ask anyone else with information on his whereabouts to contact Police.”
Mills was reported missing from his home in Mount Roskill in Auckland in June. His car, a blue Nissan Pulsar with the registration YD4731, was last seen in the Waikato area.