Except as otherwise provided, upon entry of the final order in an adoption case, the Clerk shall place all papers and records in a suitable envelope which shall be sealed and shall not be opened for inspection by any person except on written order of the court or as otherwise permitted under this rule. The Clerk or Deputy Clerks are permitted to unseal and open an adoption file only for such reasons as are necessary in the performance of their duties as custodians of the records and may furnish certified copies of the Order of Adoption to the adoptive parents.