"Caves, mines and rivers in this area have been thoroughly examined, and there is no evidence to suggest Mr Freeman is alive," Detective Inspector Tilley said.
"This will not finish. This will continue. We hope to have answers this week, but if we don't, this remains the number-one priority for Victoria Police."
Detective Leading Senior Constable Neal Thompson and Senior Constable Vadim de Waart-Hottart were fatally shot on August 26 while attending Freeman's Rayner Track property in relation to alleged historical sexual offences. A third officer was seriously injured during the incident.
Police allege Freeman fled into dense bushland behind the property shortly after the shooting.
The current operation is based on information from a witness who reported hearing a gunshot at 12:29pm on the day of the attack - around two hours after officers were shot. Police say that information has since been corroborated, with firearms testing conducted on three occasions in the area near Rayner Track.
A similar five-day search was carried out in December, but investigators paused further operations due to extreme heat and bushfire risks. A NSW Police cadaver dog will be deployed during this week's search.