When search-warrant may be issued - (1)(a) Where any Court has reason to believe that a person to whom a summons or order under section 91 or a requisition under sub-sec. (1) of S. 92 has been or might be addressed will not or would not produce the document or thing as required by such summons or acquisition or (b) where such document or thing as not known to the Court to be in the possession of a