The short answer: one USPS SCAN Form gets scanned for all shipments!
The long answer: Shipment Confirmation Acceptance Notice is a single form containing a master barcode. The barcode links all the labels you have printed for packages that are ready for drop off or pick up service.
This reduces the number of scans necessary when you drop off your packages or have them picked up by the USPS. In return, you have the peace of mind that all of your shipments on the SCAN Form have been successfully scanned in with the USPS.
The SCAN form shows the count of packages, the Ship From address and a single barcode.
After clicking the link for the tracking #, you will be taken to the USPS.com tracking page where you can see the label events. Once the package is scanned, the label event will show "Acceptance".
How to: Create a USPS SCAN form
What do I need to know about USPS SCAN Forms?
What do I do with the SCAN form when the USPS representative picks up my packages?
Why is my shipment not appearing on the SCAN form creation page?
How to: Cancel a shipment that is included on a SCAN form