Oliver Cowdery described Joseph using the Urim and Thummim during the Book of Mormon translation.
Oliver Cowdery, “Letter IV,” Messenger and Advocate 1 (February 1835): 80
[The messenger] said this history was written and deposited not far from that place, and that it was our brother’s privilege, if obedient to the commandments of the Lord, to obtain, and translate the same by the means of the Urim and Thummim, which were deposited for that purpose with the record.