My list of references to David Whitmer's account of the messenger who took the abridged plates to Cumorah includes the article by Edward Stevenson published in the 1877 Juvenile Instructor, but it's interesting to see the article itself.
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The relevant text:
While on the return journey from Palmyra [Harmony], David noticed a somewhat aged-looking man who approached them on the road. He had a very pleasant face, about which, however, there seemed something peculiar, and he carried a knapsack on his back fastened with straps which crossed his breast. David asked him to take a ride, but he declined, saying: “I am going over to Cumorah,” and then disappeared very suddenly, though there was no chance for him to secrete himself in the open country through which the party was then passing. All felt very strange concerning this personage and the Prophet was besought to inquire of the Lord concerning him. Shortly afterwards, David relates, the Prophet looked very white but with a heavenly appearance and said their visitor was one of the three Nephites to whom the Savior gave the promise of life on earth until He should come in power. After arriving home, David again saw this personage, and mother Whitmer, who was very kind to Joseph Smith, is said to have seen not only this Nephite, but to have also been shown by him the sealed and unsealed portions of the plates from which the Book of Mormon was translated.