You're SOL unless the seller on Ebay calls and reports an undelivered parcel. I had a friend ship me something for christmas worth well over $200 from a US retailer. CP said it arrived and was delivered but I never received anything. Spoke to the retailer, started a claim (it was USPS to CP, so they had to start the investigation there with USPS, not starting in Canada which makes 0 sense since it's our local delivery service that fucks up), only to wait 6 months for the retailer to refund the money back to my friend.
Biggest. Fuck ups. Ever.
I have 0 sympathy for CP lobbyists who want to fight to keep CP going because they were making cutbacks and such. Do your fucking jobs. Cutbacks should mean delays and such, not lost deliveries and dishonest couriers.