If there are minutes from past quarterly board meetings that have not been signed by the secretary that prepared them or anyone else, all that needs to be done is to have some member of the corporation or limited liability company that the minutes are prepared for that attended the meeting sign and date the minutes.Once the minutes are signed, the documents should then be embossed with the entity's seal and then placed in the books for future reference.In the future to make things easier for you, the minutes from each meeting of the entity should be drafted into written format within a week or so after the proceeding, dated, signed and sealed by the Secretary.Good luck.