I worked at USPS for almost 25 years. Whether you put a package in the collection box outside (never at night!) or a slot in the wall inside it drops into a HOD which is a white plastic box. It can be covered by letters and if the clerk who empties it takes the time they will usually catch it and scan it. If they're lazy or running short on time it goes on the truck as it is.
If you can give it to your mail carrier they can also scan it accepted and it goes on the same truck. You can put it in the box with the flag up but I have opened a lot of mailboxes like that and they were empty!
|