To find the cache, you will need to find some details from two graves. They are easy to find as they both have fences. There is actually a third grave with a fence, but sadly it is small.
The grave of James Byrne, born in Wexford Ireland, shows his death on: Jan AB 18CD
The grave of James Barratt shows; Dec E 19FG aged 5H
The final is at: S35 04.(D-A)E(B-E+1) E149 38.(G-E)(E+H)(C+F)
Don't stay after sunset.