Without a separate order in each individual case, the marshal is authorized to move the vessels under
seizure by him within the district in such a manner and at such times as he, acting as a prudent
administrator, finds to be necessary to their proper safeguarding and preservation while under
seizure. Further, and without an order of court, he is authorized to permit the moving of vessels
anywhere within the area of the district when the party at whose instance the vessel is detained and
its owner, or the owner's attorney, expressly authorizes in writing such a movement and agrees in
writing to hold the marshal and all his deputies harmless from any and all liability as a result of any
such move.