He eventually received an explanation from Ministry of Education that the error related to a possible contact rather than a confirmed case.
Prime Minister Jacinda Ardern said she's expecting the situation to worsen before it improves.
New Zealand's outbreak is a dramatic turn of events for the country, which was heralded as a world leader in how it handled the outbreak. Among the cases in China and New Zealand, it's hard to know just when the virus was introduced onto the contaminated surfaces. In overall, the country has actually reported 1,238 confirmed cases and 22 deaths.
Later today at 5.30pm, the country will find out about any further alert level changes.
Director-General of Health Dr Ashley Bloomfield on Friday said two of the new cases are in Tokoroa - 200km away from the outbreak in Auckland.
It remains unclear what caused the latest outbreak.
New Zealanders are struggling to understand how COVID-19 has reappeared in the country, months after it had been eliminated.
Chris Hipkins told Radio NZ that more than one cluster would have to be circulating for the country to rise to level 4 restrictions, and so far there was no evidence of that, though more cases from the same cluster had emerged overnight.
One of the original four worked at Americold, an American temperature-controlled warehouse company.
Speaking to The Atlantic in July, Goldman stated his position more emphatically: "Surface transmission of COVID-19 is not justified at all by the science".
"Once again we are reminded of how tricky this virus is and how easily it can spread", Ardern said during a televised press conference on Thursday. Parliament was set to be dissolved on Wednesday but Ardern postponed that to August 17 - and she is yet to announce whether the election will go ahead as originally planned.
These facilities, mainly hotels and motels that have been sealed off from the general public, house thousands of new arrivals from overseas, with positive cases placed in stricter quarantine.
The new Tokoroa cases are part of the same household and were followed up as close contacts of a family member in Auckland who tested positive.
New Zealand's Cabinet will meet in Wellington for a crunch meeting on Friday afternoon.
"People talking about the border, even that's premature at this point, we simply do not have enough information to make even an educated guess about where this may have come from", Hipkins told broadcaster 1NEWS.
He also said the chief executive of Pharmac had notified him that people were starting to stockpile medicines. But we had also prepared for it.