That's the weird thing - 2 test users have identical addresses, but only one (Flopsy Cottontail) can see the Canada Post option.
From the hikashop_address table:
"2","5","shipping","Mr","Peter",NULL,"Rabbit",NULL,"31 Dunsmoor Road",,"N6K1T6","London","6125944495",NULL,NULL,"state_Ontario_862",NULL,"1",NULL,"1"
"34","23","shipping","Mrs","Flopsy",NULL,"Rabbit",NULL,"31 Dunsmoor Road",,"N6K1T6","London","6125944495",NULL,NULL,"state_Ontario_862",NULL,"1",NULL,"1"
The 'address_country" field is set to NULL for everyone and there seems to be no way to add it via the backend customer UI.
-Alan