The farm of Camasour is listed in the 1855 valuation roll, property of Captain John Forbes of Inverernan. It isn't listed in 1865, 1875, or 1885. The only place listed under Inverernan in 1865, 1875 and 1885 but not in 1855 is Home Farm. Is it conceivable that Home Farm was originally Camasour?
Aberdeen University Library has some document(s) relating to Forbes of Inverernan, though the NRAS catalogue listing is rather less than specific.
Might there perhaps be some surviving estate maps somewhere?
However .... in the 1885 VR there is a listing of Inn and Farm, Lonach and Daldergy, property of Sir Charles Stewart Forbes, estate of Skellater. Deldergy is listed under Skellater in 1855, but not Camasour. In 1865 there's a listing of Delgach and Lonach Inn, and in 1875 it's Dalgirgy and Lonach.
Might there be a sasine recording the transfer of ownership of Camasour from Colonel John Forbes to Sir Charles Forbes between 1855 and 1865, followed by a change of name from Camasour to Lonach?