TWO men live at a Melbourne property where a woman's body has been found, but police have declined to reveal if the pair have been questioned as part of a murder investigation.

Sarah Cafferkey, from Bacchus Marsh, was last seen by her family on November 9.

Her body was found 50km away in a Point Cook house in Melbourne's southwest on Saturday night, three days after her abandoned car was found elsewhere in the city.

Forensic officers have been examining the home on Fongeo Drive today, and neighbourshave been interviewed by detectives.

Neighbours say two men live at the home and were heard using power tools late at night in the garage.

Police confirmed this morning that they believed the body was that of Ms Cafferkey.

Both men have been named on social media as having had contact with the 22-year-old woman before her disappearance, including an online spat in which she complained about their behaviour.

"Stop being immature over Facebook, please. I've had enough," she wrote on November 4.

"I will delete you if you are unable to be civil."

Detective Inspector Michael Roberts, of the homicide squad, said comments posted on Ms Cafferkey's Facebook page, involving at least one man, were being closely examined by police.

A police spokeswoman, however, would not comment further.

A nearby resident had earlier recalled hearing power tools and mechanical noises coming from the house at around 10pm or 11pm.

"They were doing some mechanical work in their garage, using power tools and things like that," the resident told the Nine Network.

"It seemed a bit odd to be doing that kind of thing," he said.

Homicide detectives took over the investigation after it emerged Ms Cafferkey's car was in a location unfamiliar to her family and that her bank account had not been accessed since her disappearance.

Police are still awaiting autopsy results to confirm the body is that of the missing woman.

"But we certainly believe it is Sarah Cafferkey," Det Insp Roberts told Fairfax Radio on Monday.

"This is a murder investigation."

He said Ms Cafferkey's ex-boyfriend was not a suspect.

Ms Cafferkey's 2001 Astra sedan was found parked in Maribyrnong, western Melbourne, about 50km away from her home last Thursday night.