Upload & Sell: On
The number on the customs form in the USA when using USPS priority is the tracking number. You can put this number in the canadapost website and get tracking. The number usually starts with CA, CV, CX ECT....when it crosses the border, customs charges the taxes on the declared value.
When UPS ground services are used, the broker is UPS and usually charges ridiculous brokerage. This is why ups ground services should be avoided. However, ups xpress or saver services have the brokerage included inthe shipping costs, so all you pay are the taxes...