William H. Dame records account of the "Cumorah Cave."
William Dame, Southern Exploring Company Journals and Chart, January 14, 1855, CHL, MS 4953
14 Sun in the morning with Brethren attended meeting a discourse from W. W. Phelps he related a story told him by Hyrum Smith which was as follows Joseph Hyrum Cowdery & Whitmere went to the hill Cormorah as they were walking up the hill a door opened and they walked in into a room about 16 ft square. In that room was an angel and a trunk. On that trunk lay a book of Mormon & gold plates, Laban’s sword, Aaron’s brestplate.
Note: the CHL scan does not include a page of the final sentence. The rest of the transcription has been taken from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=1360&context=jbms.