Testimony of Prophet Joseph Smith
“The box in which they lay was formed by laying stones together in some kind of cement. In the bottom of the box were laid two stones crossways of the box, and on these stones lay the plates and the other things with them.”
The plates, Urim and Thummim and breastplate were protected from the elements by being covered from wind, rain, snow and erosion. They were also raised from the ground to avoid water damage. They were sealed to be protected from animal interference, and hidden such that they could be identified by those who need to know, but hidden from the rest of the world.
Likewise, our precious worldly things should be protected by our proper planning, that they may last us through our needs and beyond. This means properly saving and safely investing our money, planning for retirement and for emergencies. And when we pass on, how shall our wishes regarding our possessions and savings be interpreted without a Urim and Thumin? For this reason we prepare by having a Will and power of attorney, making our wishes known in some formal and legal documentation.