Section 12. All persons sentenced to any of the correctional institutions of the commonwealth shall be held in accordance with the sentences or orders of the courts and the rules and regulations of the commissioner. The personal property, valued in excess of fifty dollars, of all inmates held in correctional institutions of the commonwealth or in institutions maintained under the provisions of chapter one hundred and twenty-six shall, in so far as practical, be permanently marked with an identifying number assigned to the owner. If said property is removed from the possession of the owner, the owner shall be given a receipt, prior to any such removal.