Possessions belonging to ex-Network 10 presenter Jesse Baird, 26, and Luke Davies, 29, were found on Wednesday in a bin in a suburb of the capital.
Police are seeking a man identified by local media as a police officer who once dated Mr Baird to aid inquiries.
But the force told the BBC it could not confirm the person’s identity.
In a statement, New South Wales Police Force said detectives would “continue to look at all past relationships and associations”.
Officers found blood and moved furniture at Mr Baird’s home in the Paddington area, around 28km (17 miles) from Cronulla, the suburb where a worker found the couple’s belongings in a bin.
Blood-stained clothes, a phone and credit cards were among the items found.
CCTV footage showing a white van in the area was also being looked at by police, the news outlet said.
Flight attendant Mr Davies has not been in contact with his family or attended work since Monday, according to police.
Det Supt Jodi Radmore said all lines of inquiry were being investigated and told reporters: “We do believe, from the crime scene at Paddington and from property located at Cronulla, that there has been some sort of incident.”
She added that had given the force “great concerns for one, possibly both their safety”.
“Witnesses described a verbal argument,” she continued, “but it wasn’t reported to police at the time … it was only reported to police yesterday [Monday morning] during canvassing.” https://merujaksore.com/