Cache is located at S 33 25.AB5 E 149 36.CD7
The following link has the answers to the missing co ordinates
https://2mce.org/podcast/john-fennell-fourth-commandant/
If link not working also available at https://www.bathurstregion.com.au/things-to-do/discover-heritage/pillarspodcast/
Listen to the short story for the answers.
A= John Fennell arrived in Australia in 182A
B= Raid on Saltram 182B
C= John Fennell died C July 1826
D= John Fennell buried at Kelso cemetery D July 1826. Subtract 6 from answer