The New York ISC, or International Service Center, processes most inbound international letters and packages quickly, releasing them within three days. During busy times, such as the winter holiday season, items take up to 10 days to move through the facility.
In rare cases, the ISC detains a package or letter due to suspicions about the contents. This applies if the contents are subject to additional customs fees, lack documentation, possibly violate trademark regulations or are believed to be contraband. When that happens, U.S. Customs and Border Protection sends notification to the intended recipient with further information on getting the item released. This process takes anywhere from a week to 45 days depending on the mail volume and the specific problem with the item.