What does "cocket" mean?

Cocket: (Eng. Law) A customhouse seal; a certified document given to a shopper as a warrant that his goods have been duly enstered and have paid duty.

Additional senses

  1. 2.An office in a customhouse where goods intended for export are entered. [Eng.]
  2. 3.A measure for bread. [Obs.] Blount.

Sources