It seems pretty logical to me that based on the ad above, the B18s were NOT attached to Sovereign cigarette packs but were instead handed out by dealers at point of sale. Just look at the fine print at the bottom that instructs dealers to get a supply of the B18s.
As others have mentioned, there are B18s with remnants of a blue band on them, so it seems most logical to me these were still adhered to a brand of cigarettes in addition to Sovereign, and Egyptienne Straights definitely seems most plausible given the Lipset article and the specificity around the packaging.
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