The Collaborative International Dictionary of English v.0.48:

Incase \In*case"\, v. t. [imp. & p. p. Incased; p. pr. & vb.
   n. Incasing.] [F. encaisser; pref. en- (L. in) + caisse
   case. See Case a box, and cf. Encase, Enchase.]
   To inclose in a case; to inclose; to cover or surround with
   something solid.
   [1913 Webster]

         Rich plates of gold the folding doors incase. --Pope.
   [1913 Webster]