i think your thinking of the climbing issue 154, from 1996 i believ. it has bob "traversing" at dorthy's barefoot, on the right and lower of the "flake".
in the picture you can see the upper flakes at that time have no chalk on them, and murray clearly has chalk on his hands and a large one hanging off his hips. so im sure the flake would have chalk on them if bob would have tried it.
my earliest times bouldering at dorthy's is around 1999, and even then the uppermost flake was not chalked. sometime from 2000-2002 a tick mark appeared just below two small crimps. no chalk on them, so me and a couple of locals that bouldered there regularly started trying. after a summer of trying, a few people were able to match hands on the upper most flake and fall off.
a few years later, absent because of college, me, a few friends met up with ruben lewis, and projected again. again the high point was the upper most flake....
then this past summer, i arrived again, this time i met up with leadville local john crum, ruben, matt moore, and a couple of summer raft guides. i chalked up the two possible crips, and the projecting begain. to my knowledge that was the first time the crimps were ever used, a deadpoint dyno from the upper most flake to the crimp, and was only stuck for a fraction of a second....V7 my ass. there are still 2-3 more moves, and the mantle might be the overall crux.