If you decide to return a mailed item to its sender after accepting delivery from Canada Post, you can be refunded any duty or taxes you paid on the item. However, you will still be charged the Canada Post CAN$9.95 handling fee.
To request a refund of duty and taxes, simply complete the back of Form E14, CBSA Postal Import Form, and send it to the nearest Casual Refund Centre listed on the form.
You will have to provide proof that you returned the goods. For example, you could include a store’s credit note or a letter from the sender.