Hale says he could heft the weight of the plates in a box.
Isaac Hale Statement in "Mormonism,” Susquehanna Register, and Northern Pennsylvanian 9, no. 21, May 1, 1834, 1
I was allowed to feel the weight of the box, and they gave me to understand, that the book of plates was then in the box—into which, however, I was not allowed to look.