No issue with them bouncing stuff to test it. But they just put it by the door, no knock, doorbell or notice at the mailbox -- which they have to pass. Some use the front door, most use the side door.

I've found stuff after a day or 2 of it sitting at the front door. At the side door, we use that twice per day but if they deliver after Dad comes home at 4:30 or so, it sits until next morning.