Well if it's Great Lakes printers you are after, I would look at Strecher-Traung Lithographers of Rochester, NY. I suspect they did overflow work for Topps in the 1960's and it would not surprise me if they printed cards for other firms.
I would have to check but the laws in Canada may have allowed US items to be shipped in and sold in Canada if "manufactured" in Canada until about 1970. The product may have been all that required manufacturing, not the box.
There are rumors of 1954-55 Topps hockey sheets being shipped to OPC in London, Ontario via Detroit so I daresay anything is possible.
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