Yes Tom, I'm aware of these pairs from Al's auction and the results of the research:
There is an expense in producing, packaging and distributing cards. A sponsor's reason for absorbing this cost is to influence people to remain or become customers. Scrapps carry no message - no advertisement - no reminder of where the cards originated. This is still a part of the mystery missing from the story. All other insert cards bear a printed sponsor's ad. That is why I included a (?).
I shared my believe that neither of the PACKAGING that united the product and the card in each case existed - never disagreed with the HDS.