Some shipments, especially those shipped by couriers, are released automatically or based upon the available information, However, Customs expects all the correct and accurate information to be confirmed within a specific time frame. The time frame is within 5 business days. Low value shipments are given a bit more time; however, we prefer to keep within the 5 day time frame as the shipment details will be more fresh in your mind and there is not a risk of getting AMPS penalties for failing to meet the deadlines.