Police are treating it as a homicide and believed he was killed the day before Christmas Eve in the afternoon.
Detective Superintendent Dave Hutchinson said yesterday that a Crimestoppers bus was set up outside the crime scene on the same day of the week, at the same time as the killing, to try and get more information from people in the area.
"We just wanted to remind everybody going past that this did occur and if they have seen something on that particular Friday that they haven't told the police to come forward."
Between 10 and 20 detectives working on the case every day, he said.
Police were not at a dead end in their investigations, but Mr Hutchinson could not say what lines of inquiry they were following.
"We still believe that there are people out there who know things that they haven't told us, so we want to reinforce the facts of what occurred and appeal to them to come forward." APNZ