I have a survey map (undated) of part of the area. It shows Corshellach - which is on the Balblair property (where I grew up). It is spelled Coirshellach on the map but I think it is the same place. Adjacent to it, less than a mile away is Coire Buidhe and there is small hill there called Cnoc a' Choire Bhuidhe. This could be Corbuie - I'm sure you know better than I do - the pronunciation is almost the same. I remember the Coirshellach house but that is as far as I go. Elspeth