First, please track your package online to see the latest information. Second, check with your neighbor, receptionist desk, or where your packages may have been dropped off at. Next, please contact the carrier (i.e. your local national post office, UPS, or DHL) to inform them that you have not received the package. If your order contains 3 or more pairs, signature upon delivery is required. For international customers, please check the tracking number provided to you via email to see if your package has been held at customs. You may need to pay custom fees or VAT imposed by your country on imported goods before the package can be delivered to you.