Any bidder or applicant for a sale may be required to furnish a statement of his relation to other bidders or operators, including, if desired by the supervisor or Regional Forester, a certified statement of stockholders or members of the firm, and the holders of bonds, notes or other evidences of indebtedness, so far as known, so that the statement will show the extent of the interest of each in the bidder or applicant.
36 C.F.R. §223.89