Call back and speak to the Postmaster. If you don't get results (but you should) call the regional office. The delivery person is scanning them delivered because they don't want to deliver but they have to scan it or else their scanner will show a discrepancy. Which gets them in trouble. They are lazy. They are probably just scanning them delivered and then throwing them to the clerks at the window. If you dont get a notice though you dont know that it is at the window. If you explain it to the Postmaster they are going to know what is going on and know what to look for.