Police said they were "disappointed" after no significant discoveries were made during a new search for Suzanne Pilley.
The two-day search to find the missing Edinburgh woman's body ended at 1600 BST on Sunday.
It took place over the weekend in the Argyll forest and focused on the area between the Rest and Be Thankful and Ardgartan.
Lothian and Borders and Strathclyde Police were joined by 150 volunteers.
The volunteers came from rescue teams from Arrochar, Lomond, Tweed Valley, Oban, the Trossachs, Caithness and Sutherland and the Scottish Cave Rescue Organisation.
Numerous animal bones, items of clothing and artefacts were discovered during the search but were confirmed to be of no significance to the inquiry.
The 38-year-old bookkeeper disappeared on her way to work in the capital on 4 May. Her former lover, David Gilroy, denies her murder.
Miss Pilley's father Robert said his family was desperate for "closure" regarding the case.
Det Ch Insp Gary Flannigan, of Lothian and Borders Police, said he was "humbled by the support" received from all over Scotland.
Following the search he said: "Everyone involved is understandably disappointed, particularly for the Pilley family, that the extensive search this weekend did not result in the recovery of Suzanne's body.
"I would like to reassure Suzanne's family and friends that we will never stop searching, and will always act on information that comes in."