Wasn’t the Caribou wreck left at Tapini for a long time?
Maybe, not sure. The RAAF bent a few DHC4s in PNG, plus the civil DHC4 near Kiunga. I remember the wreck recovery from Eliptamin, Tufi and a few other places. They may have left one at Tapini but I know the RAAF are very "shy" of having their mishaps on public display.
Corrected "Tefalmin" for Eliptamin as noted by Chimbu below.