Quick was given clear instructions by email that the package must be marked warranty. When I complained to them they insisted that thry had marked the paperwork as directed. I then sent them a copy of the paperwork proving them wrong. That was when they stopped responding to me. You don't work for Quick do you ?
Take a look at my location and you will have the answer to that question. Pretty sure Quick doesn't have an office in Edmonton, AB Canada.
As I stated before, they are under no "obligation" to mark papers in any way, other than declaring what is in the package. YOU, are the Canadian citizen importing a good. Its %100 up to you to deal with our customs and immigration people (even in a warranty situation).
I would like to point you to the official Canadian rule on warranty or replacement goods. No matter what they marked the item, you would owe Duty on it again!
Here is the pertinent section!
23. Where a replacement good is provided to a customer
rather than repairing the original good, the replacement
good is classified under Chapters 1 to 97 of the Customs
Tariff and full customs duties are owing. The importation of
the replacement good is generally subject to GST/HST,
unless the conditions of section 5 of Schedule VII to the
Excise Tax Act are met.
24. GST/HST relief under section 5 is available whether
the warranty relates to tangible personal property or to
property that has been incorporated into real property.
25. Where the conditions of section 5 are met, GST/HST
Tax Status Code 55 is entered in field 35. The invoice or
written statement from the non-resident supplier must
provide the value of the replacement good even where there
is no charge to the importer