ebay seems to now provide a new form of tracking number for ?US? and Canada under the name "eBay Delivery Services"; starts with an "esus" followed by 8 number, for example "ESUS12345678"....*removed* seems to be able to take them and spit out the real tracking number, in my case it was a USPS tracking number.... if any questions, I can provide screenshots/tracking number; unsure how common this is but figure it might be helpful info