Ship or handle means to pack, sell, consign, transport or in any other way to place potatoes grown in the production area, or cause such potatoes to be placed, in the current of commerce within the production area or between the production area and any point outside thereof, so as to directly burden, obstruct, or affect any such commerce: Provided, That the definition of ship or handle shall not include the transportation of ungraded potatoes within the production area for the purpose of having such potatoes stored or prepared for market, except that the committee may impose safeguards pursuant to § 945.53 with respect to such potatoes.