Gosh, Good luck, Don! There can't be too many people living there - native or expat - who were there in '72. My wife and I lived there for three years from January '72 till April '75; we're not there now, but I don't even remember the visitors you mention. Old age, of course, but still... You might like to check out the website of a friend of mine from those days - link below. He might remember your chaps; you could ask him. His email is as per the website.
http://neilbegley.com.au/stories/