You exactly mirror my thoughts about this series. I've always been intrigued why there wasn't more interest in this first part of the BN history, with the (for me) fantastic 7000 series. Maybe because it was about Dixieland revival and boogie woogie and not the stuff BN got famous for, like the latter series 1500.
I have some of them. I don't remember how I got them. I only remember it was hard. I have numbers 7, 11, 13, 15, 16. And some of this material came out in a US series (no reissues of albums, just comps), celebrating BN's 60 anniversary, with some Bechets and the great Blue Note Swingtets in 98. So I thought for the 70th there was going to be another great special collection from BN. But nope. Maybe by that time times were so troubled for them they didn't even consider it.