Ron,
No definitive proof on either front, but here is what I've been told and/or know. There is evidence that the position cards came in the Mayo pouches (in the form of a story of a pouch being opened in the ate 90's and a position card being pulled out). As for the Mayo tins, there is an article appearing in paper around the 1900s discussing how 5 baseball subjects were packaged in lunchbox tins. While I do not believe that Mayo was named in the article, it is the only brand that ever produced lunchbox tobacco tins and baseball cards. Of note, however, is I do not believe the article mentioned boxing cards or other Mayo issues.
- Jon
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