Federal unclaimed property site: https://www.usa.gov/unclaimed-money

State unclaimed property index (find your state site at the top): https://unclaimed.org/search/#

Yes, I have. My state has a website where you can search for and claim your funds back. It's quite easy.

Happens all the time. They even used to publish lists of unclaimed funds in the paper. It's occurred to me twice in my lifetime.

I've got a $200 check sitting on my desk from this very thing.