No no no...
It’s hard for YOU to come up with a document to prove YOUR point.
OK, you win, this back and forth is killing me. I'll go first:
Here are early sources which mention Moroni that were edited by Joseph Smith and others (some even hostile), which demonstrate that the story about Moroni was well known to members of the Church and even enemies:
D&C 27:5 - 18301835
and with Moroni, whom I have sent unto you to reveal the book of Mormon, containing the fulness of my everlasting gospel. D&C 27:5
Mormonism Unvailed - 1834, reprinted as History of Mormonism in 1840 [anti-Mormon work]
After he had finished translating the Book of Mormon, he again buried up the plates in the side of a mountain, by command of the Lord; some time after this, he was going through a piece of woods, on a by-path, when he discovered an old man dressed in ordinary grey apparel...The Lord told him that the man he saw was MORONI, with the plates
Messenger and Advocate - 1835
I have now given you a rehearsal of what was communicated to our brother, when he was directed to go and obtain the record of the Nephites and I believe that the angel Moroni, whose words I have been rehearsing, who communicated the knowledge of the record of the Nephites, in this age, saw also, before he hid up the same unto the Lord, great and marvelous things, which were to transpire when the same should come forth.
Elder's Journal - July 1838
For those holy men are angels now. And these are they, who make the fulness of times complete with us. And they who sin against this authority given to him...sins not against him only, but against Moroni, who holds the keys of the stick of Ephraim.
Elder's Journal - July 1838
How, and where did you obtain the book of Mormon?...Moroni, the person who deposited the plates, from whence the book of Mormon was translated, in a hill in Manchester, Ontario County, New York, being dead, and raised again therefrom, appeared unto me and told me where they were and gave me directions how to obtain them. I obtained them and the Urim and Thummim with them, by the means of which I translated the plates and thus came the book of Mormon.
D&C 128 - 1842
And again, what do we hear? Glad tidings from Cumorah! Moroni, an angel from heaven, declaring the fulfilment of the prophetsthe book to be revealed. (D&C 128:20)
Now, since it's your theory (really the anti sites, but you accept them hook line and sinker, so I'll give you the benefit of the doubt) that there is documentation proving Joseph claimed Nephi as the angel, I will now let you post what you can to support that claim.
Have fun!
Also, just to throw a little wrench into the mix, Joseph did say that he was visited by Nephi as well as many ancient prophets as the fullness of the Gospel was restored, so that may be where the printers error happened, but I'll leave that to you to find it. He never said it was Nephi who came in place of Moroni. Cheers! ;-)