apparently someone tested ice cream and ice cream tests positive
Even if New Zealand had COVID in the wild, current thinking is it's impossible to get Covid from milk powder, or even a public toilet seat.
Fomites is anything which can carry infection, such as clothes, utensils, and furniture. Also known as contaminated surfaces, such as a toilet seat.
English translation for below: if you've got a surface covered in COVID, there's a person nearby who has COVID. So look for a person person not wearing a mask, and remind them they're are killing people.
WHO: Fomite transmission
...Respiratory secretions or droplets expelled by infected individuals can contaminate surfaces and objects, creating fomites (contaminated surfaces). Viable SARS-CoV-2 virus and/or RNA detected by RT-PCR can be found on those surfaces for periods ranging from hours to days, depending on the ambient environment (including temperature and humidity) and the type of surface, in particular at high concentration in health care facilities where COVID-19 patients were being treated. Therefore, transmission may also occur indirectly through touching surfaces in the immediate environment or objects contaminated with virus from an infected person (e.g. stethoscope or thermometer), followed by touching the mouth, nose, or eyes.
Despite consistent evidence as to SARS-CoV-2 contamination of surfaces and the survival of the virus on certain surfaces, there are no specific reports which have directly demonstrated fomite transmission. People who come into contact with potentially infectious surfaces often also have close contact with the infectious person, making the distinction between respiratory droplet and fomite transmission difficult to discern. However, fomite transmission is considered a likely mode of transmission for SARS-CoV-2, given consistent findings about environmental contamination in the vicinity of infected cases and the fact that other coronaviruses and respiratory viruses can transmit this way.