Every deed, release or other instrument in writing purporting to transfer any interest in land held or claimed by the department of human services or a predecessor agency, which is signed by a departmental official, and which was filed of record more than ten years earlier, in the office of the auditor or recorder or clerk of the district court of any county is legalized and shall be good and valid in law and in equity as fully as if the record expressly showed that it in all respects complied with and was fully authorized as provided in any statute pertaining to such instrument, any other provision of law to the contrary notwithstanding.