Having lost the trophy, the police were talking up their chances of winning it back in a touch rugby tournament in November, but Michael said the prisoners were determined to retain it.
Another prisoner, who led the whakatau for the police, and the haka, which he had learned while in Kea Unit, said the tournament had changed his view of police.
"Cops aren't all how I saw them on the outside. They're actually good people, and it's cool to get to know them," he said.
Organiser Mark Taylor, a senior constable in Kawakawa police, said the games had been hard-fought, but the prisoners deserved their win.
"The goal is interaction between police and the young fellows in there, to let them know this is who we are. We aren't just uniforms, we're people too," he said.
"Now when they get out they know they can come and ask us questions, and we can offer guidance in the outside world if they require it."
Acting prison director Michael Rongo said some of the prisoners were anxious about interacting with police, and worried they'd be recognised.
"A lot of these young men only ever engage with police when something bad happens. As a result they have some barriers, some resistance to authority," he said.
"This is about breaking those barriers down and seeing police in a different light, showing they are human."