The Ministry of Health said there'd been a number of efforts around wider community testing by public health and primary care.
More than 400 samples were taken from two supermarkets test sites in Mangere and Henderson in Auckland and all had negative results.
"As we have noted previously, this is similar to the results from previous testing in Queenstown and in locations across the Waikato.
"Targeted community testing continues to be part of our ongoing surveillance against Covid-19, which helps provide us with assurance that there is not undetected community transmission."
New Zealand will find out this afternoon at 4pm whether the country will come out of lockdown and move to alert level 3.
The Cabinet started meeting at 10.30am and will base its decision on testing and contact tracing capacity, community transmission, border restrictions, and the capacity of the health system.
When asked yesterday if we were likely to stay in level 4 for another week until contact tracing is at a gold standard, Arden said: "We are not going to get into hypotheticals."
There were nine new coronavirus cases in New Zealand and one new death announced yesterday.
The death brings the total toll to 12 and was of a man in Invercargill who was linked to the Bluff wedding cluster. It is the first coronavirus death in the community.
The man, aged in his 70s, died in his Kingswell home on Tuesday evening. The Bluff wedding cluster has been connected to more than 90 cases, including the death of the groom's father.
The total of confirmed and probable cases in New Zealand was now 1431, and 912 people had recovered.
There were 18 people in hospital, including one each in ICU at Middlemore, Dunedin and North Shore hospitals; two were in a critical condition.