The Board shall make promptly available to the public in the Public Reading Room the transcript, electronic recording, or minutes of the discussion of any item on the agenda or of any testimony received at a closed meeting, except for such item, or items, of discussion or testimony as determined by the Board to contain matters which may be withheld under the exemptive provisions of § 1704.4. Copies of the nonexempt portions of the transcript or minutes, or transcription of such recordings disclosing the identity of each speaker, shall be furnished to any person at the actual cost of transcription or duplication. If at some later time the Board determines that there is no further justification for withholding a portion of a transcript, electronic recording, or minutes or other item of information from the public which has previously been withheld, such portion or information shall be made publicly available. The Board shall maintain a complete verbatim copy of the transcript, a complete copy of the minutes, or a complete electronic recording of each meeting, or a portion thereof, closed to the public for at least two years after such meeting, or until one year after the conclusion of any Board proceeding with respect to which the meeting, or a portion thereof, was held, whichever occurs later.