(a) Except as outlined in § 2.29 of this subpart, a bureau must exercise due diligence to promptly notify a submitter in writing when it receives a FOIA request if: (1) The requested information has been designated by the submitter as confidential information under § 2.26(a) of this subpart; or (2) The requested information has not been designated as confidential information by the submitter under § 2.26(a) of this subpart, but the bureau identifies it as possibly confidential information. (b) If
(a) If a submitter has any objections to the disclosure of confidential information, the submitter should provide a detailed written statement to the bureau that specifies all grounds for withholding the particular information under any FOIA exemption (see § 2.31 of this subpart for further discussion of Exemption 4 objection statements). (b) A submitter who does not respond within the time period specified under § 2.28(d) of this subpart will be considered to have no objection to disclosure of the