6 minutes ago, Smithy said:IIRC they were a thrift store find.
WRONG! But I still think you are fairly safe. They are Canadian product from a Canadian dairy producer. I do not think they are available south of the 49th parallel but I could be wrong! Here’s the thing. They do not come with a reusable lid. Some stores do carry the lids as a separate purchase and you can get them directly from the dairy. They are not too easy to find.