Any statistical information furnished in confidence to the Bureau of Foreign and Domestic Commerce by individuals, corporations, and firms shall be held to be confidential, and shall be used only for the statistical purposes for which it is supplied. The Director of the Bureau of Foreign and Domestic Commerce shall not permit anyone other than the sworn employees of the Bureau to examine such individual reports, nor shall he permit any statistics of domestic commerce to be published in such manner as to reveal the identity of the individual, corporation, or firm furnishing such data