Victorian police said they would go back to the Wonnangatta area on Monday "as a result of information obtained from previous searches".

Two shovels were found during a search of the Mt Hotham area on April 14, about 100km from Wonnangatta, and police said these are still being examined.

The search will now focus on the area along the Dargo High Plains Rd, Cynthia Range Track, Herne Spur Track and the Wonnangatta Track.

Mr Hill, 74, and Ms Clay, 73, went missing from the Wonnangatta Valley in March last year.

Police believe Mr Hill left his Drouin home on March 19 and picked up Ms Clay from her home in Pakenham in his white Toyota Landcruiser.

Mr Hill was last heard from on March 20 via HF radio, stating he was at Wonnangatta Valley.

Campers found Mr Hill's car with signs of minor fire damage at the duo's campsite near Dry River Creek Track in the Wonnangatta Valley the next day.

Their campsite had been destroyed by fire.

A number of searches have been conducted in and around the Wonnangatta Valley during the past 12 months, including on April 4 this year with cadaver dogs.

Police conceded at the time it was unlikely Mr Hill and Ms Clay were still alive.

They continue to investigate whether the pair met foul play.

Detectives continue to appeal to anyone who was in the Wonnangatta area around the time of the campers' disappearance to make contact.

They also want to speak to anyone who was in the Howitt Plains and Zeka Spur Track area on March 19-20, and the Wonnangatta Valley and Wonnangatta Station area from March 20-24.

Australian Associated Press