Here's what I heard from Vestapol Video (a fantastic Folk Video company). You can find them at rounder.com.

J.B.Lenoir was part of the Lipmann & Rau American Folk Blues Festival that toured Europe in 1966 (I believe). This show also featured Lightnin' Hopkins, Howlin' Wolf, John Lee Hooker and others. J.B. did one tune. That's the only footage I have located of J.B. over the years.