Examples of an update or change include adding or removing packages associated with the printed SCAN Form. To ensure package information is not duplicated, updates or changes cannot be made once a SCAN Form is printed. SCAN Forms must be used in conjunction with electronic USPS Tracking or electronic Signature Confirmation, otherwise they cannot be used. Also, each package can be associated with only one SCAN Form. When using a SCAN Form, all packages must be shipped the same day the shipping labels are printed. SCAN Forms are available for any customer who prints shipping labels via an online postage vendor. After being scanned, shippers and package recipients can track and check the status of their packages using the USPS Tracking number. When the barcode is scanned, the package information is instantly transmitted into the USPS tracking database, notifying both shippers and recipients that their shipments have entered the USPS mailstream and that the shipping process has started. This format allows the USPS employee to save time as not every package needs to be scanned to retrieve the shipping and tracking information for the shipment.
These forms are then scanned by a USPS employ upon collection of of packages. The USPS and Endicia Shipment Confirmation Acceptance Notice (SCAN) is a document which contains information about the associated packages with a group shipment through a master barcode located on the SCAN form.