Upon the conclusion of the hearing in each case the commissioner shall transmit to the judge all papers relating to the case, together with his findings and recommendations in writing. Notice of the findings of the commissioner, together with a statement relative to the right to file a motion for rehearing, shall be given to the minor, parents, guardian or custodian of the minor whose case has been heard by the commissioner, and to any other person that the court may direct. This notice may be given at the hearing, or by certified mail or other service directed by the court.