Most of the Caribou prangs were due to mistakes that one would more than likely have been able to recover from in Australia e.g pressing too far up a closed valley, pressing approaches that should have been abandoned much earlier, lack of appreciation of a poor (low) approach, mis-identifying airfield. They serve to reinforce the unforgiving nature of flying in PNG....and Irian Jaya.
There was also a write off at Tapini and another damaged at Efogi - but that one may have been airframe age deterioration.
I think the only fatal Caribou accident was the Kudgeru but, that was a particularly bad one with an aircraft full of PNG Army cadets. I think 3 or 4 kids miraculously walked out of it.