The modern chapter division separates these verses from their important context. It was done to make the Malachi chapters match the King James Version chapters and verses. However, these verses serve to confirm that the intent of Jesus’s examination of the Nephite scriptures was to add what they did not have. One of those things was the fulfillment of Samuel’s prophecy that the dead would rise from their graves and be seen, an event that would have happened between the beginning of the year when the destructions occurred, and now. This is because they were a witness that the destructions signaled Christ’s death, which also signaled that he would rise from the dead.
The important verse is verse 2, which closes the adding of scripture by noting that Jesus had given them scripture which they “had not with [them].”