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About 25 people, including RCMP officers, civilian employees of the force and volunteers, are combing through a wooded area on the reserve.
Robin Cocks, who was in his mid-30s, vanished in 2003 but his skull was found in the area on April 13, 2012.
Cocks was born Robin Timothy Jamieson and was originally from the Dalles First Nation, before being adopted.
He was believed to be hitchhiking to Vancouver when he vanished.