Hey there,

If you're using Amazon Shipping, it would be Amazon collecting the packages rather than USPS. We offer a variety of collection types for our shippers, including loose load, container, and palletized, depending on the number of packages you need to ship. We collect your packages from your warehouse and deliver them to your shipper with stop-by-stop tracking. You can read more about the program here.

Let me know if you have any additional thoughts or questions.

- Bryce