At the Scottish government website for National Records of Scotland is the following document extract from the Rose of Montcoffer (Kinharrachie) Papers, dated 17 July 1797 :
"Genealogy of the Hays of Rannes and Lenplum, 1421-1790, for use in monument inscription for deceased Andrew Hay of Rannes [see GD36/273], with copy covering letters [from William Rose] to Charles Hay, advocate, Edinburgh, and General [Alexander] Hay".
I see elsewhere that Rose (Montcoffer) William Rose (1740-1807) was factor to James Duff, 2nd Earl of Fife, at Duff House, Banff, from c1763 to 1795.
I'd say the inscription is reliable. To see the extract, search for Ref. #
GD36/271 at http://catalogue.nrscotland.gov.uk/nrsonlinecatalogue/search.aspx.