Police in Canterbury are still seeking information on the whereabouts of 58-year-old John Old.
Police were informed he was missing on Thursday afternoon and are concerned for his wellbeing.
Mr Old is described as 168cm tall, with a slim build, short grey hair and a short white beard.
He is believed to have flown into Christchurch Airport on the morning of Saturday December 3, 2016 - the same date his family last heard from him.
It is believed Mr Old is in the Canterbury area, possibly the high country lakes.
Any information on his whereabouts since last Saturday afternoon, or sightings of him, should be reported to 111.