I sell my crafts on both Ebay and Etsy sending out at least a dozen packages each week. I have this happen several times a month. It worries my customers and myself. USPS has a place on the website where you look up tracking info, where you can ask for email or text updates on the progress of a shipment from the time it is shipped until delivery. I have found if I request this, within 24 hours usually, I get an update on the package and it gets on its way. It seems like Mississippi is one place where they get stalled alot. Anyway, I don't know if it will work for you, but it might be worth a try.