The Collaborative International Dictionary of English v.0.48:

Mislay \Mis*lay"\, v. t. [imp. & p. p. Mislaid; p. pr. & vb.
   n. Mislaying.]
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   1. To lay in a wrong place; to ascribe to a wrong source.
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            The fault is generally mislaid upon nature. --Locke.
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   2. To lay in a place not recollected; to misplace; to lose.
      [1913 Webster +PJC]

            The . . . charter, indeed, was unfortunately
            mislaid: and the prayer of their petition was to
            obtain one of like import in its stead. --Hallam.
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