That's because the man did not start feeling unwell until more than three days after he arrived back in the country, the Ministry of Health said in a statement.
The man did attend a church service at St Mary's church on East St, Papakura, on Sunday March 8 at 8.30am before he became unwell. Attendees were on Saturday afternoon in the process of being contacted.
Family contacts of the man would also be offered testing and contact tracing was under way in Auckland, the ministry said.
The sixth confirmed case would be monitored daily by health services, Bramley said.
After starting to feel ill, the man did everything right by phoning ahead to his doctor and telling them of his travel history, about a possible link and his symptoms.
He was then assessed in his car by his GP, who was wearing the appropriate protective equipment.
Protective gear, which includes a gown, goggles, face mask, and gloves had been sent to 420 GP practices across Auckland, Bramley said.
The two previous patients in hospital - one confirmed case and another probable - were now back at home and recovering. Daily checks are being undertaken on the two by health staff.
All close contacts of the other five confirmed cases - 252 total - were in self-isolation and were also being monitored daily by health staff, the ministry said.
Community members who were sick were told by Bramley to stay at home and not head out to public events or even work.