In another video they said they planned to kill more people and expected to be dead in a week.
Describing the killers’ demeanour in the video, Hackett said: “They were cold, they were remorseless, they were matter of fact.”
He described another video as “chilling”.
In one of the videos, the teenagers said they were planning to highjack a boat and escape to Europe or Africa.
They also said that they had made a suicide pact and wanted to be cremated.
Hackett said police had decided not to release the videos out of respect to the victims’ families and because they did not want to sensationalise the killers.
Fowler, the son of NSW police chief inspector Stephen Fowler, and Deese were killed in July while on a road trip through remote British Columbia.
Schmegelsky and McLeod then murdered Vancouver botanist Leonard Dyck, 64, before fleeing to the province of Manitoba in eastern Canada, where they committed suicide.
The killings led to one of the biggest and most gripping manhunts in Canadian history.
“The murders appear to have been random and crimes of opportunity, with no known motive,” Hackett told reporters at a press conference in British Columbia.
“We have no evidence that lead us to identify what the motive was.
“If there was a motive it went with them.”
Police interviews with the killers’ families, friends and teachers did not reveal what led them to go on their rampage.
“While we have been able to gain greater clarity on the movements and the actions of the two accused, we respect that the answers have not reduced the trauma and the grief experienced by the [victims’] families,” Hackett said.
The police report describes an encounter along the Alaska Highway, two days after the first killings, when a motorist pulled over by the road spotted “an unknown male” with a long gun.
It is believed they had encountered either Schmegelsky or McLeod.
“The male … started moving towards the witness in a tactical or hunting stance,” the report says. The motorist then drove away.
Matthew Knott a reporter for The Sydney Morning Herald and The Age based in the United States.