hi Natalie,
I knew Dick from 1967-68 at the Aeroclub in Port Moresby. I was doing my Instructor training plus some charter work. I remember the time of his loss, but we were a long way from Wewak, and not needed for the search. I'd returned to Australia in 1970, and hadn't heard of the location of the wreckage until the 1990s, and that was via the huge PNG thread on Pprune. You could search for more details on it. I think there is also reference to it in vol. 2 of the Balus series by Jim Sinclair?
kind regards,
Ralph Burnett aka potoroo, (still flying at age 85)