Section VII. Provided always, that if any Owner, Importer, or Consignee shall omit to pay any duty or penalty tha

VII. Provided always, that if any Owner, Importer, or Consignee shall omit to pay any duty or penalty that may fall due on account of Goods Warehoused under this Act, it shall be lawful for the Collector of Customs at his option, either to proceed upon the Bond, or to cause such portion of the Goods Warehoused on account of which the duty or penalty may be demanded, as to him may seem fit to be detained, in satisfaction thereof; and if the demand be not discharged within ten days from the date of such detention (due notice thereof being given to the Importer, Owner, or Consignee) the Goods so detained shall be liable to be sold in satisfaction of the demand. And the proceeds of any sale so made of Goods detained, shall be written off upon the Bond in discharge thereof to the amount received less the charges of the sale; and if there be any surplus obtained from such sale beyond the amount demanded, such surplus shall be paid over to the Owner or Consignee of the Goods, and no transfer or assignment of the Goods shall prevent the Collector from proceeding against the Goods in the manner above provided for, any demand of Customs Duties or Penalty claimed thereon.