§§ 801.2 and 801.50 shall not apply to any transaction that has been the subject of investigation by either the Federal Trade Commission or the Antitrust Division of the Department of Justice in which, prior to the effective date of that section, the reviewing agency obtained documentary material and information under compulsory process from all parties that would be required to submit a Notification and Report Form for Certain Mergers and Acquisitions under Section 801.50 but for this transitional rule.