USPS Scan Form
You can print the USPS Scan Form by going to the Order History->EOD and click on the "USPS Scan Form" button.
You should print the scan form on the same day the packages will be picked up. The cutoff time from USPS to be able to generate the Scan Form for the same day shipment would be 8pm Pacific Time.
You can generate the Scan Form multiple times during the day. Every time you print the scan form, it will include the form you have generated last time + the form for the new shipments after that.
If you have setup multiple shipping profiles and each shipping profile has its own address, the scan form will be generated with several pages, with one page corresponding to each shipping profile address.
NOTE: If your package is a First Class Large Envelope/Flat it is not eligible to be included on the SCAN form as it is not a trackable package type.