Once your package leaves my hands, I unfortunately have no control over the package.
If the package has been marked as delivered, you will need to contact your local post office immediately!
They will be able to help you more than I as one of the following might be the cause:
Your mail carrier may have marked the package as delivered early - it could show up in a day or two.
Your mail carrier delivered your package to a neighbor. Check with your neighbors to see. Many carriers will ask if you've done this before starting a claim.
Your mail carrier attempted to deliver the package but was unable to. Usually your carrier will make another attempt on the next business day. Sometimes, the only thing to do is wait an additional business day to see if the package shows up.
Your package was sent to the wrong address. Sometimes this happens if you have an outdated address for your account. Double check that the address was correct.
Delivery of your package was unsuccessful. This can happen for a variety of reasons, but normally in this case, the package will be sent back to me. If I get any return packages, I'll try my best to contact you via email to confirm a delivery address before I send it back to you.
Your package is lost or stolen. If you suspect your package has been stolen or was lost in transit, please open a mail theft case with USPS and get in touch with me.
It is your responsibility to file a claim with the Post Office in regards to lost packages marked as "delivered."