Ole A. Jensen's account of Martin Harris recalling finding a stone box but it slipped back into the hill.
Ole A. Jensen, "Testimony of Martin Harris," undated, 3, MS 5569, Church History Library
After Joseph had found the plates. Three of us took some tools to go to the hill and <hunt> for some more boxes, or gold or something, and indeed we found a stone box. We got quite excited about it and dug carefully around it, and we were ready to take it up, but behold by some unseen power, it slipped back into the hill. We stood their and looked at it, and one of us took a crow bar and tried to drive it thru the lid to hold it, but it glanced and broke one corner off the box. Some time that box & will be found, and you will see the corner broken off, and then you will know I have told you the truth.