Step 6. If your package has been mailed, the . Postal Service will deliver it after it clears Customs. If you owe duty, the Postal Service will collect the duty along with a postal handling fee. If a freight service transports your package, they will notify you of its arrival and you must go to their office holding the shipment and complete the CBP entry procedure. If you owe duty or tax, you will need to pay it at that time in order to secure the release of the goods. You could also hire a customs customhouse broker to do this for you. However, be aware that customhouse brokers are private businesses and are not CBP employees, and they charge fees for their services.