I knew about the Goudey place, I think National Chicle is still standing? And Delong. Haven't looked for US Caramel.
The George C Miller location I think went to the Mass Pike. Either that or was removed around then and some new place built. The closest I can find for the address is a tiny houselike building. That just doesn't seem right unless the office was in a house and the warehouse was somewhere else. Or maybe they had someone else print and distribute- There were a lot of gum/candy places in town doing cards.
I always imagine a print shop salesman having a really good year selling the idea of cards to just about every place in town.
Steve B