Police are urging people who visited the alpine area of Wonnangatta in March to make contact as they investigate the disappearance of Russell Hill and Carol Clay.
The pair's burnt out campsite was found at Dry River Creek Track in the Wonnangatta Valley, about 45 kilometres south of Mt Buffalo, on March 21, with damage to Mr Hill's white Totota LandCruiser.
But there has been no sign of the pair, and it remains unclear if their disappearance is suspicious.
Investigators have urged anyone at Howitt Plains and Zeka Spur Track on March 19 and 20, and the Wonnangatta Valley and Wonnangatta Station from March 20 to 24, to make contact.
Possible sightings were also made around Black Snake Creek and the Eaglevale River crossing on March 22.
IN OTHER NEWS:
"Police would like to speak to anyone who was in these areas at the time so they can be accounted for as part of this investigation and eliminated accordingly," spokeswoman Natalie Webster said.
Call 1800 333 000.