They are trying to determine whether the police hierarchy had ordered "to shoot to kill" at that time.
Kapris and Wilimini were being pursued because they had escaped from Bomana jail.
Family members of the dead men and others alleged the duo had surrendered to police but were killed.
The autopsy report showed most of the bullets penetrated the victims' backs, which corroborated statements from witnesses at the scene of the shootings.
A preliminary investigation by the paper showed a reward was offered for their recapture or killing.
It also uncovered that the police command in Port Moresby had issued a "shoot to kill" directive.