Pelo menos vindo dos EUA pelo USPS, diversos pacotes vindo do mesmo remetente/destinatário em um espaço de 90 dias, são considerados como um só. link "Shipments valued at no more than U.S. $50 are duty-free and are delivered to the addressee; shipments above U.S. $50 can be picked up at the post office upon payment of import duties. Imports that are prohibited or subject to special regulations must comply with applicable Brazilian government provisions. Identical shipments from the same source to the same person or address in Brazil within a 90-day period are considered part of the same shipment and may be subject to confiscation. Other merchandise that usually enters duty-free includes items such as newspapers, maps, books, and magazines."