Not sure, but it wasn't an official stat until 1979-80 season
I assume you mean blocks weren't.
However, Russell did have multiple seasons in which he averaged close to 5 apg, so it's indeed somewhat surprising he never triple doubled.
He probably did, I'm guessing it's kind of hard to tell, judging by the state of game logs from that era.
Yeah, statistically, it would be shocking if he didn't have some triple-doubles, and if anecdotes are to be believed, some quadruple-doubles in there, too.
In 1967, for instance, he averaged 5.8 assists per game. I'd be very surprised if he didn't hit 10 assists in some of those games, and the rebounds (21.0 per game) are almost a given. Points were always iffy with Russell, but 10 isn't a high burden.
Russ did have a 26 point, 27 rebound, 20 block game in the last game of his college career.
That's 2 games worth of triple doubles, in one game.