The Kinderhook plates were presumed lost, but for decades The Church of Jesus Christ of Latter-day Saints (LDS Church) published facsimiles of them in its official "History of the Church". In 1920, one of the plates came into the possession of the Chicago Historical Society (now the Chicago History Museum). In 1966, this remaining plate was tested at Brigham Young University. The inscriptions matched facsimiles of the plate published contemporaneously, but the question remained whether this was an original Kinderhook plate, or a later copy.