As 1879 Graves posted, Boasts report is about as good as it gets, as nobody kept records at the time. What it could do with doing is a GPS survey of those existing, however one surmises how many were..."relocated" when the cap park was built. Why this wasn't put near the gatehouse is anybody guess, make the b**gers walk!,
Boast lists alot of cairns on the top of the Telehane Ridge, I can vouch for the fact they are no longer visible and difficult to discern even in short grass.
By far the most amount of cairns which are not "maintianed" are those on the fugitives trail, and now these are sadly being lost to erosion (and excavation).
Those near Melvill and Coghill, are reputed to be Colonial/ native men.