A short time earlier, Nephi wanted us to know that he had written two sets of plates, but they are both called the plates of Nephi. Nevertheless each set has a different purpose. Nephi apologizes that he cannot include some of the great things his father had received while living at their first encampment.
We later learn that the historical plates are called the large plates of Nephi while the present record we are reading is called the small plates of Nephi.