the only thing you can do apply to the USPS for your shipping insurance plus your cost of shipping the product.
The sender can't apply to USPS since he purchased the shipping service from Canada Post. He has to file for a payout from Canada Post.
CPO transferred the shipment to USPS under the terms of the Universal Postal Union Treaty of 1874, and USPS is their sub-contractor (sorta) and is responsible to CPO not to the sender.
Some sellers who use forwarders are USPS customers, but not those who shipped at the neighbourhood postal outlet.
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