The most famous case in Australia is in Belanglo State Forest, about 100 miles SW of Sydney and just off the main Sydney-Melbourne road. The first of (so far) seven bodies found in the forest were found in 1992 by orienteers running a course (and were not far from a control, but the course setting team had not noticed anything). Orienteers training in the forest independently the next day and wondering what all the police were doing there were briefly of interest to said police. I guess it's one of the few mentions of orienteering in
Wikipedia, beyond the main 'orienteering' entry. The map is named "Executioner's Drop" (after a cliff on its northern edge, away from the road and where the bodies were found, but still...).
A discussion on O-net at the time decided that a black 'x' (for 'man-made object') was the appropriate symbol.
I think orienteers in Britain have also found at least one body.