Customer Product Refunds Policy
Customers may obtain a refund for product returns with a value of $0.01 up to a maximum of $5,000, including taxes, at any post office. For refunds over $100, Customers must also complete the Customer Refund form.
The Customer must have an original receipt issued within the last 30 calendar days by a post office when returning an item.
The following three (3) types of products are available for refund:
postage values
philatelic products retail products.
Taken from
https://www.canadapost.ca/textonly/...licies-e.asp