I found this tin cover for a milk bottle from Cowan’s Dairy in Brockville today. I have no idea how old it is, but according to their website it has been run as a convenience store from 1980 to the mid 2000s. The current owners now sell ice cream in the old factory. https://www.cowansdairy.com/history.html
There is a great picture of the factory on their website and some amazing looking treats too.