Louis De Zoysa remains critically ill in hospital after the fatal shooting of Sgt Matiu Ratana.
First-year halls were known to be at risk and outbreaks were "inevitable", top scientist says.
Customs officials said hospital material and plastic was found in the shipment, in breach of rules.
Silvana Tenreyro said evidence from countries that have introduced the policy was “encouraging”.
Labour hints it could back Conservatives trying to increase MP scrutiny over lockdown restrictions.