Are you referring to coins before a certain year? If I don’t live in your area of the country (I’m in Maryland), I’m not competition for your coinstar diving, so, help a lady out here...
I might only find it once or twice a month. Roosevelt dimes are the most common. Though I did once find a 1967 Kennedy Half Dollar which is 40% silver.
By the way, I love your tagline.
Hold on to any 1964 and earlier silver coins - any kind - they have the highest silver content.
When you buy ‘junk silver’ it is usually a combination of those coins in a bucket. I have several that I’ve inherited from my dad. The value is based upon weight when you go to cash them in.
1964 or before, all dimes, Quarters, and halves were 90% silver.