In the case of imported commercial goods, the storage is managed by the private sector. Those goods are not necessarily stored in the agency's stockrooms. They are put into sufferance warehouses that belong to private companies. That's how things are already being done.
In cases where the legitimacy of a shipment is in doubt, the bill will enable the agency to contact the rights holder and to legally detain the goods for 10 days, to give the holder time to take matters to the court.
Storage costs are included in import costs. That aspect will be managed by the private sector, and not by the Border Services Agency.