BCP 242 Waiparous
A bit of an epic search.... we made hard work of the approach on our way out this morning. Found the sset of four posts but did not find the cap. After some research in the field at a high point, we knew where to look. So on the way back we stopped again and took a few tools of the trade. After some more probing and clearing a glint of metal appeared. 10 mins later we had the cap visible and recorded the numbers :)
A fun search that required that we get creative was rewarded.