While my product is my consulting and software I invoice to Canada as. My bet is this is then hoping you will reveal such but I wouldn't. It is required to show country of origin but no law mandates you reveal your cost. If you follow what VAT does they pay on what they paid you and not what you paid for the product.

If this needs more explanation I will defer you to a lawyer but as I trade there (albeit not a hard good) and lived there for many years, I can offer this to you.

Be sure to cultivate this relationship. Call and talk but your costs are yours to keep.