With any of the delivery services, including USPS, you can choose whether the package can be left "in the mailbox," whether the package is "tracked" so that you can see where it is prior to delivery, whether the delivery person sends a notice back to you to confirm the date/time when it was "delivered" and/or whether someone at the delivery address must sign for the package.

As with anything relating to "big business" it can be very difficult to know, in advance, what delivery conditions are applied. You must INSIST on a full explanation of how the package is marked, and what the markings mean, when you deliver it to the service. And some "intake persons" seem uninformed about what the various service classes actually mean, and may not be able to explain.

The USPS is particularly notable for its "special conditions." They will sell you the "next day delivery" service even if the fine print states that next day service is not available from the PO from which you are sending, or is not available at the PO from which the package is delivered. There are also, where the service is available, fairly specific limits on when the package must be sent (e.g. "postmarked" before noon) and on weekend/holiday delivery dates.

It ain't easy to send it right and getting it at the delivery end remains pretty much a crap shoot until you've "learned the rules" and follow them carefully. (And the rules change with surprising regularity.)

John