The USPS scans every single piece of mail processed. If you sign up for the free Informed Delivery service you can even see the scans of mail that have are scheduled for deliver that day.
https://informeddelivery.usps.com/
The USPS scans every single piece of mail processed. If you sign up for the free Informed Delivery service you can even see the scans of mail that have are scheduled for deliver that day.
https://informeddelivery.usps.com/