Section 1115. Conditions Affecting Forfeiture of Goods.— The forfeiture shall be effected only when and while the goods are in the custody or within the jurisdiction of customs officers, or in the possession or custody of or subject to the control of the importer, exporter, original owner, consignee, agent of another person effecting the importation, entry or exportation in question, or in the possession or custody of or subject to the control of persons who shall receive, conceal, buy, sell, or transport the same, or aid in any of such acts, with knowledge that the goods were imported, or were the subject of an attempt at importation or exportation contrary to law.