Detective Inspector Scott Beard called for the public to report any sightings of a black 2005 Ford Falcon saloon registration CTS862 linked to the incident.
The car was seen in Pakuranga on Sunday.
Beard also revealed police were still hunting for the firearm used in the murder, which was believed to be a rifle.
Yesterday, a 21-year-old woman wanted in connection with the killing handed herself into police.
She appeared in the North Shore District Court charged with being an accessory after the fact to murder.
Beard thanked the community for their help and the public sightings that were reported of the alleged offender.
He said a team of detectives were working around the clock since the incident.
• Anybody with information on the whereabouts of these two items were urged to contact Waitemata Crime Squad on 09 839 0697 or Crimestoppers anonymously on 0800 555 111.
