Joseph translates papyri in early July 1835.
Joseph Smith, History, 1838–1856, volume B-1 [1 September 1834–2 November 1838], 596, The Joseph Smith Papers website, accessed August 10, 2021
<6 Purchase of the Egyptian Mummies.> Soon after this, some of the Saints at Kirtland, purchased the Mummies and Papyrus (a description of which will appear hereafter) and I, with W[illiam] W. Phelps and O[liver] Cowdery, as scribes, commenced <Translation of some of the Characters.> the translation of some of the characters or hieroglyphics, and much to our joy found that one of the rolls contained the writings of Abraham; another the writings of Joseph of Egypt, &c, a more full account <of which> will appear in their place, as I proceed to examine or unfold them. Truly can we say the Lord is beginning to reveal the abundance of peace and truth.