I think part of the issue is that pure Blaberus discoidalis seem to be a rarity in culture. Many of them out there are the result of other Blaberus crosses to increase fecundity (i.e. with B. fusca, at least at some point down the line in the culture) which may still be considered illegal. Just speculating, but the sellers may be trying to cover their tracks for this reason if they aren't 100% sure of the origin/lineage of their cultures.