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Alan Collison, 43, left his home in a grey Toyota Surf about 6.10am on Monday, February 22, a police spokesperson said.
"He has not been seen since, however, his vehicle was located along the Heaphy track, north of Karamea, (on Thursday).
"Police and Alan’s family have concerns for his welfare and would like to hear from anyone who can help locate him."
If you have any information that may help police, phone 105 and quote file number 210223/3129.