Susan, are you saying that all of the the numbered "Culzean Charters" are deposited in Mitchell Special Collections in Glasgow and that all of the numbered charters are detailed in a specific book ?
Some numbered "Culzean Charters" (i.e. #536) are detailed in the book "Wigtownshire Charters" edited by R.C. Reid, LL.D., published Edinburgh, Printed by T. & A. Constable Ltd., printers to the University of Edinburgh for the Scottish History Society, 1960. I think that this is the Scottish History Society, 3rd Series, vol. #51.