R.I. Gen. Laws § 31-4-2: Endorsement and forwarding of registration card.

The owner shall also endorse the name and address of the transferee and the date of transfer upon the reverse side of the registration card issued for the vehicle and shall immediately forward the card to the division of motor vehicles. However, the number plates need not be returned if the owner shall, within ten (10) days of such transfer or assignment, secure the registration of another vehicle.