It's interesting to think about. I do know that the large tin cans were loaded with grease and hands would be slimy with it after eating, no wonder most of the cards are stained. Seems like those large tins were phased out in the mid to late fifties. We didn't have DanDees in Detroit area, but we had Lays and Bettermade that came in tins. On a trip to Pittsbrg in about 54/55 (I was just a little tyke) my older brother (by 10 yrs) got DanDees out of those tins. He seems to remember that there was more than one card in the can. Can't be sure though. Those cans are available on ebay, would be nice as an ancillary item for a DanDee collector (if one collects such things). BTW please mention the title of your book?
Dave.