Nice recovery on the Buffalo nickel. I put some of my dirty coins in a soft drink machine the other day, hit the change return and all I got back was my dirty coins.
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I did this in high school in the early 1990s and hit war nickels from time to time. Back then they were worth maybe $0.20 in silver, and I finally was told to stop since the "lunchlady" got tired of putting coins back into the change trays. Then I figured out how to get dimes from one older machine - put in 50 cents and got 5 dimes back - I got silver dimes every so often but got in trouble for that too. Some people...
Cool vending machine find! Buffs are still circulating and while coin roll hunting I would average 1 about every 2,000 nickels. Never got one with a date, always slicked out. I did luck out on a shield nickel from a Coke machine about 30 years ago. You just never know what will show up and it pays to at least look at your change.