The Collaborative International Dictionary of English v.0.48:

Hanaper \Han"a*per\ (-[.a]*p[~e]r), n. [LL. hanaperium a large
   vase, fr. hanapus vase, bowl, cup (whence F. hanap); of
   German origin; cf. OHG. hnapf, G. napf, akin to AS. hn[ae]p
   cup, bowl. Cf. Hamper, Nappy, n.]
   A kind of basket, usually of wickerwork, and adapted for the
   packing and carrying of articles; a hamper.
   [1913 Webster]

   Hanaper office, an office of the English court of chancery
      in which writs relating to the business of the public, and
      the returns to them, were anciently kept in a hanaper or
      hamper. --Blackstone.
      [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

HANAPER OFFICE, Eng.law. This is the name of one of the offices belonging to
the English court of chancery. 3 Bl. Com. 49.