HI just general talk. I once tried to pick up a wooden shotgun shell box 2/3 full of Old Mexican silver coins - cache equal to 10 boxes of them - the bottom fell out.
The coins came from a find in an old house. While completely legal, we didn't want the entire neighbor hood to know. we stacked them neatly in the wooden box, which is very sturdily constructed of heavy seasoned wood. We left about 1" on top, covered them with paper them covered that with perhaps 1" of dirt to hide the contents..
First try, sheehs we couldn't budge it, We then realized that there was almost !/2 cu ft of Silver, which is equal roughly to to #250+ of these .900 fine coins.
After adjusting the weight to about #75, I still walked rather stiff legged out to the truck, so I doubt that we fooled anyone hehehe.
Don Jose de La Mancha
p.s. The bottom episode came when we were trying to adjust the max weight that we could lift and carry out to the truck.