Did you ever leave a job before you got your last paycheck? Or had an expired check that you forgot about?
After three to five years unclaimed property in California goes to the State Controllers Office and if they can find you, they will send a notice in the mail, otherwise it sits in the database, potentially indefinitely. Sounds weird, but unlike fishing scams, this money was yours to begin with it just never got to you because of the wrong address or some similar problem.
All you need to do to see if you have unclaimed property waiting for you, is to follow this link https://ucpi.sco.ca.gov/UCP/Default.aspx. Naturally you have to identify yourself to claim it through a form and normal forms of id- like your Driver's License etc.
Hope you find something! It's fun to search. Merry Christmas!