I guess their back-catalog would yield a few such sets - George Adams, Don Pullen, David Murray, Max Roach, Andrew Hill etc etc. Maybe if there is a feeding frenzy on these sets more will come.
By the way does anyone know where there is a complete discography of these labels/ Many titles are in print and listed on their website, though you can't browse it by artist name which is a drawback. What these labels did was document, in some cases extensively, many American (and other) artists who were and mainly are ignored by American labels, or who spread their activites between independents (of which BS/SN must be the largest) and were made very welcome in Europe. These boxes are a welcome reminder that these Italian labels are actually classic labels - during decades which may be less than truly classic, but at least we have the evidence. So hats off to Giovanni Bonandrini and his catalogue of 500+ titles - let's hope for a few more box sets.
I'd love to see a David Murray box.