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The case is now the subject of a new episode of Cold Case NZ, which will screen on TVNZ 1 at 8.30pm on Tuesday.
It wasn't until seven weeks after Christmas Day that a neighbour raised concerns about Hinkley who lived alone in a central city unit.
He was 1.84m tall and of solid build, and had a shaved head when he was last seen.
He was last seen wearing dark pants, a black T-shirt with a large white pattern on the front and a blue peaked cap with a dark blue logo on the front.
There have been no sightings of Hinkley reported to police since he went missing.