Shipping packages may be seized at the “port” if they have been illegally transported (not complying with all the rules and regulations) or their custom duties are paid incorrectly. In such cases, importers of banned or illegal goods may be arrested and imprisoned from being involved in shipping such items. In respect to this, will USPS tell you if your package is seized?
If your package is some other kind of illegal, they will send you a notice to pick it up at the post office — law enforcement will be notified when you arrive for the pick up.
Also, can the USPS withhold my mail? yes, if you have anything that presents a hazard to the carrier delivering your mail safely. They can hold it(for 10 days if necessary) but most of the time I just get out and deliver it. That doesn't warrant a PO Box though.
Additionally, what happens if USPS seizes a package?
Once the package is 'seized', it may be examined by a drug dog, and a warrant will be issued to open the package should the dog alert for the presence of drugs (typically, the post office will line up 6 packages, five which they know do not contain drugs, and the suspected package).
Does USPS have drug dogs?
No, USPS, FedEx and UPS do not scan and use drug dogs on every package in their possession. At USPS, the volume of parcels (6.2 billion in 2018) makes it impossible for every package to be vetted. Drug sniffing dogs are used on occasion at certain facilities, as deemed appropriate by the US Postal Inspection Service.
Related Question Answers
What makes a package suspicious USPS?
Are sent unexpectedly or from someone unfamiliar to you. Are addressed to former employees or use improper job titles. Have no return address or cannot be verified as legitimate. Have unusual weight given the size, or are lopsided or leaking an unknown substance. Can police open USPS packages?
First-class letters, priority mail and parcels mailed through USPS are protected by a federal law against mail tampering and against obstruction of correspondence. That's not to say investigators need a warrant to look at the outside of your first-class mail and private packages. They do not. Does USPS XRAY priority mail?
Customers may send either Priority Mail® or Priority Mail Express™ items for expedited handling. This mail is not irradiated unless it is sent to the White House. Mail may arrive in a plastic bag(gie) with a letter explaining the sanitization process (if the mail was sanitized). Can USPS see what's in my package?
Users can also receive USPS Tracking updates for incoming packages via separate email or text notifications. The dashboard displays mailpiece images for a seven-day period, while package information will display for 15 days after each package has been delivered. How do I know if my package seized my package?
The best way to find out why something is detained is to simply call the CBP office where the goods are being held and ask them. You usually will get a written notificaton from CBP telling you that your shipment is being held and why and what you can do about it. Former U.S. Customs officer and licensed customs broker. Can the mailman refuse to deliver your mail?
Ruiz said carriers may refuse to deliver mail to places they feel are unsafe or threatening, such as a home with a dangerous dog. However, the Postal Service is supposed to leave a written notice to residents if they stop deliveries, telling them where to pick up their mail. Why is USPS not delivering my mail?
If your mail is arriving late, being misdelivered, or you are having a problem with an attempted delivery, please contact your local post office, your local Postal Service Consumer Affairs office or you may file a complaint online. My mail has been lost or delayed. You can also file a claim for the lost/delayed mail. How do I report a mail not being delivered?
Call 1-800-ASK-USPS (1-800-275-8777) or TTY: 1-800-877-8339. Speak to the station manager (postmaster) at a local post office. How long can mail sit in mailbox?
ten days
Does the post office scan all mail?
The digital mail tracking programs had raised concerns about their sweeping nature because the post office and law enforcement agencies are allowed to monitor all mail, not just the mail of those suspected of a crime. The scanning machines at the mail processing centers only keeps images of the letters they scan. Do drug dogs smell mail?
Feds use dogs to sniff out drugs in mail packages. New weapon in fight against opioid epidemic; Matt Finn reports from Chicago. CHICAGO – Some of the frontlines in preventing lethal opioids and fentanyl from getting into American communities happens to be at the United States Postal Service. Is it legal to mail prescriptions?
You are only permitted to mail prescription drugs via the USPS if you are a pharmacist or medical provider mailing such drugs to the patient they have been prescribed to. This means that without proper medical licensing you can receive prescription drugs, but you cannot, under any circumstance, mail them. 
