I ended up with some extras in the quest also:
1916 Group-4.jpg
For those interested, the last 4 backs to complete the group were
- Herpolsheimer
- Morehouse Baking
- Ware's Basement
- Standard Biscuit
I was lucky with this search because Mall Theatre and Burgess & Nash were offered in the same auction last year. I would have thought those two would be among the last.