How you can get "junk" silver at face value

I think there are better uses of your time in prepping then sorting through coins hoping for a silver one. A good deal of my "junk" silver came from my grandfather who owned a retail store and started setting it aside when they announced the 1965's wouldn't have silver in them. The stuff is heirloom"ish" to me but its clearly just junk silver - nothing of significant value other then bullion prices on pre 64s. In light of the OP of this topic would you not be better off with pennies prior to the copper cut off or nickels even with the higher amounts of copper and nickel in them? I don't have those dates and (thanks to Grandpa I never really sort for that stuff). Mind you when I had the food service venue I did before 2009 a boy came in one time and paid $3.50 for his treat with 4 pre 64 quarters and 5 pre 64 halves. My employee was honest enough to point it out to me, but the child was long gone or I'd have sent him home with the coin and told him to return with something everyone else used. I still have those.