Do you know about
USPS Informed Delivery feature? It's a really good service that some of you may find useful.
It's offered by USPS and notifies you daily of packages and letters that will be (or should be!) in your mailbox or PO Box by the end of day.
I signed up and so far so good. Have only received letter notifications since signing up. It's not available in all postal codes, but it's still worth checking out if you haven't done so already.
https://informeddelivery.usps.com