An old family friend worked at a drive in theater back in the 1950’s and early 60’s and collected pennies by sorting thru the coinage she received from customers at the snack bar. Before her career was done she’d found every regular issue Lincoln penny except the 1909 S VDB.
Sadly her addict son took the collection and used them as ordinary pennies to buy booze.
For a minute I read this as 1913 and thought “holy shit, my childhood dream come true!”
Anyhow… the best things I ever found were a 1939 Jefferson nickel, and a 1943 P Jefferson nickel with the large P. (none too valuable, but still a cool find).
Recently my dad found a $5 US silver certificate from the 1960s… in the change machine at the business he runs. Some poor sucker effectively paid $100 for a car wash. He finds lots of cool things in there.
When I was a kid, maybe 8-10, my father had a stack of old silver dollars on his dresser. One day I took them and spent them. I didn’t sell them, I spent them at face value. When my father found out, he beat the crap out of me.
I suspect it is still kids stealing from their parents change collections that contributes the vast majority of “new” finds.
Many years ago, I ran a movie theater. Now the adult tickets were $4.75 so a couple was $9.50. Each week I would get a couple hundred in half dollars. Out of every $300 or so I would get about a buck in silver. The best part was the customer would get the half, wonder what the heck it was, and march over to the concession stand and spend it.
At one point I had the owner chewing me a new one for ordering halfs, followed by wondering why the per-head was higher at my location verses the rest of the small chain.
Marketing was not his strong point. 
We had standing orders that any super bills were to be sold to the safe($500 and $1000).