Wrekkdd, as the OP says, the design is the same on both sides of each of the 12 coins. Which means they're not actual coins, but copies or replicas of some kind.
I can confirm that the coins being copied are Canadian, rather than British, Australian, South African or elsewhere in the Empire. Canada had a distinct set of words and abbreviations on their coins, and these pieces match. Specifically, the coins copied were George VI coins dating from the period 1937 to 1948 (when the IND IMP was dropped). Which might give some indication of when the pieces were made.
Given the damage, and the holes, my first guess would be Chinese funeral money, made for use by the Chinese diaspora in Canada. Replica-money is ritually burned in traditional Chinese funeral practice.
Second guess: a really, really crude attempt at making a circulating counterfeit. The holes would be a defacement by the shopkeeper who received them, to render them unusable. It would be odd for one person to acquire so many identical counterfeits, though... fool me once, sure, but fool me 12 times?
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis