Section 5C. All petitions for adoption, all reports submitted thereunder and all pleadings, papers or documents filed in connection therewith, docket entries in the permanent docket and record books shall not be available for inspection, unless a judge of probate of the county where such records are kept, for good cause shown, shall otherwise order. Such petitions, reports, pleadings, papers, documents and permanent docket and record books shall be segregated. A separate permanent docket book shall be provided for all such entries. This section shall apply to the index of the court of all such entries, a separate index of which shall be provided.