If the goods have a value less than $ 100 (and that they are non-commercial quantities), you may go to the customs office of your jurisdiction with the documents that certify you as an importer, so that they can prepare the Customs Declaration Form ex officio to carry out the formalities. For commercial merchandise or value greater than $ 100, you must contract a Customs Agent or Agency.
Art.136 General Customs Law (LGA) and 433 Regulations to the General Customs Law (RLGA).