Disclosure limitation.

The information described in sub. (2) shall not be made available to any nonresident or to any resident who is making the request for such information for the use or benefit, directly or indirectly, of a nonresident person or firm or a foreign corporation except to the extent that similar information in the state of residence of such person or firm or the state of incorporation of such foreign corporation is made available to residents of Wisconsin or Wisconsin corporations. As part of the statement required by sub. (2), the department shall require any person desiring to obtain such information to declare whether the person is a nonresident of the state and whether the information is desired for the use or benefit of a nonresident person or firm or a foreign corporation. No copy of any return shall be supplied to any person except as permitted by sub. (4).