The original article on the subject came out in the spring of 1982 -- I remember because it was the second article I wrote for GOLF Magazine. The article was George Peper's idea -- he loved the title "The Untouchables," and we could use it without fear because Oscar Fraley (who wrote the book about Eliot Ness) was a contributing editor to GOLF at the time. But they needed someone who would take the time to research the article and write it for scale, and I had the time.
There were about twenty par fives which hadn't been reached at the time. I'm sure that most of them have been today, although I believe the 7th at Pine Valley is still unbesmirched, and I'd guess there are others. There are probably also a lot of newer golf holes which haven't been reached in two yet (I haven't heard of anyone holding the 11th green at Stonewall, for example), but if you brought an entire field of Tour pros out to practice on them, not many would survive the onslaught.
Which is just as well. The ideal long par five is one which is stupid to go for, but which offers just enough hope so that long hitters will get themselves in trouble. The players who fare best on long par fives are usually straight hitters who hit it in the fairway twice, and then a short iron onto the green.