Origin postal service is preparing a shipment container for dispatch and creating a shipping manifest of packages in that container, which is headed to USA.
Foreign postal services consolidate packages destined to a country into containers and create a shipping manifest, including tracking information (if available and applicable), of each individual package in that consolidated shipping container.
When the consolidated shipping container is packed and sealed it is dispatched for shipment. When the container is scanned at point of lading, the status of all of the packages on that manifest will update.
I am hope it makes sense and is answer you are looking for.