Can anybody tell me why Canadian coins keep ending up in my piggy bank?

I live upon a horse opera seashore of a state of Michigan, it’s so irritating when a bank teller hands me behind candain coins-knowing which we can’t make use of them. Can someone discuss it me because canadian coins finish up in a income supply.
currently we have $1.75 in Candian coins how most would which be in US dollars.

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