Bay of Plenty DHB bought and blessed two refrigerated containers last year to prepare for Covid-19 fatalities - one is at Whakatāne Hospital and the other in Tauranga.
MidCentral DHB has also brought a container onsite at Palmerston North Hospital and Waikato DHB brought three containers to Waikato Hospital last year to store up to 54 bodies.
The West Coast, Hawke's Bay, South Canterbury, and Southern DHBs have also planned to take on containers if required in uncontrolled outbreaks.
Whanganui, Auckland, Waitematā and Counties Manukau did not answer RNZ's questions.
But overall University of Auckland epidemiology professor Rod Jackson does not think our morgues are ready for waves of Covid deaths.
"Nothing in New Zealand is prepared for an outbreak of Covid, a major outbreak.
"It doesn't matter whether you're talking about the morgues, hospitals, [or] primary care," he said.
He expected mass fatalities would overwhelm all of these services.
IRS sales manager Glenn White has provided plug-in, chilled containers - worth more than $10,000 each - to five DHBs and funeral homes during the pandemic.
"They bought them. We couldn't reuse them if they'd had bodies inside, we couldn't wash them down and put somebody's food inside."
Kiwibox has also provided a refrigerated container to a hospital for Covid-19 body storage.
Co-owner Greg Flynn was approached last week, to send another, to a Pacific nation.
"They couldn't find any stock in Auckland - we're only South Island-based - so they rang around a bit. So they're obviously thinking about it over there in case they ever get overloaded with Covid deaths."
Morquip mortuary equipment suppliers have also provided refrigerated containers.
Co-owner Russell Griffiths said these were "fit out with racking and shelving for body storage".
He said there had been increasing demand for "body bags and stainless steel trays" through the Delta outbreak, not only from DHBs, but also from funeral homes, the New Zealand Defence Force and New Zealand Police.