The Collaborative International Dictionary of English v.0.48:
Mislay \Mis*lay"\, v. t. [imp. & p. p. Mislaid; p. pr. & vb.
1. To lay in a wrong place; to ascribe to a wrong source.
The fault is generally mislaid upon nature. --Locke.
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.