"Sadly, we have now reached the point where all possible search options have been exhausted, and as such, the search will be scaled back."
Her car, a yellow Hyundai Getz, was found on Friday parked at the entrance to a track with her cellphone inside. She was familiar with the area and is thought to have run the track about 10 days earlier.
Her older sister Storm, who lives in Paihia, put out a call via Facebook on Friday night urging anyone who had seen her "little sis Kim" to contact her urgently.
Kim Bambus' parents are keen sailors who live in Opua. When their daughter went missing they were in their yacht off Great Barrier Island so sailed through the night to Auckland to join in the search.
Her father, German-born Bernd Bambus, has worked as a relief PE teacher at Kerikeri High School.
Storm Bambus' Paihia employers said they were trying to support her as best they could at a very difficult time. A workmate was planning to travel to Auckland last night to support her as the search was scaled back.