In March of 15, 1859 Tischendorf wrote a letter to the Minister von Falkenstein announcing the Sinaiticus manuscript. This was published in the Literary and Scientific Appendix to the Leipziger Zatung in April 17. 1859 as
'Ein Brief des Prof. Dr. Tischendorf an den Staatsminister v. Falkenstein',
By July of 1859, this reached the English Press in the
Journal of Sacred Review
The Literary Churchman: A Critical Record of Religious Publications
Tischendorf's Recent Discovery p. 257-258
The Literary Churchman took issue with the idea given by Cowper that the CFA was identified.
"The only other Greek parchment MS. to which I had before given a chronological place prior to the Vatican, was the Leipsic Codex Friderico-Augustanus, but this, as I am already convinced, is a relic of the very MS. of which I am so happy as to find these important constituents." - Cowper translation, Journal of Sacred Literature, 1859
Reprinted here in a review of the 1860 Tischendorf book."He appears to identify the new manuscript with the Codex Frederico-Augustanus, but his expressions are very ambiguous. .. We do not know if he alludes to this or some other discovery. Time will shew."
The Christian Remembrancer, Volume 41 -Jan 1861
New documents on Constantine Tischendorf and the Codex Sinaiticus (1964)
In 1855, he declared that the 43 folios of the Frederico-Augustanus were but a part of what he had seen on his previous trip, but maintained silence as to where he had seen the manuscript: Cf. Monumenta Sacra Inedita. Nova Collectio, I (1855), p. xxxx. However, he waited until March 15, 1859 before admitting in print that the Frederico-Augustanus was but a fragment of the manuscript he had found on Sinai. This, he said in a display of deadpan humor, had become clear to him beyond any doubt: Cf. " Kin Brief des Prof. Dr. Teschendorf an den Staatsmlnlster v. Falkenstein," Leipzigrr Zeitung, Wissenschaftliche Beilage nr. 31, April 17, 1859, p. 137.
This private letter was published. However, in the public arena, Tischendorf kept the issue vague. The 1862 Bibliorum Codex Sinaiticus Petropolitanus, printed in Leipzig, did not include the CFA text.