Results of these investigations were expected to take several weeks.
Henry's body has been released to his family. He will be buried in a private ceremony later this week, police said.
"Police officers involved in yesterday's exchange of shots remain on duty and are receiving appropriate support as required.''
Opotiki couple Alan and Anne Looney, who were allegedly attacked by Henry at their home on Sunday evening, described the incident as traumatic.
The couple, aged 66 and 63, had their hands slashed and were tied up before their attacker fled in their Ford Ranger with their rifle and a credit card.
"We feel really traumatised by what has happened. We are very simple people leading a very simple life and find it hard to comprehend that something like this could happen to us,'' they said in a statement.
It was difficult to imagine ever feeling safe again, Mr and Mrs Looney said.
They also acknowledged Henry's family, and thanked the community for their support.
"We expect that his family are going through a trauma of their own.
"Everyone has been fantastic and the support from the community has been overwhelming. The phone has apparently been ringing off the hook with people wishing us well,'' the couple said.