Find old 401(k)s in the Labor Department's lost-and-found
Added
If you changed jobs over the years, look up retirement plans tied to your Social Security number in the free Retirement Savings Lost and Found Database. You sign in through an ID-verified Login.gov account, then contact the plan administrators it lists to see whether anything is still owed. It covers private-employer and union plans, not IRAs or government plans.
The result
Result: DOL: the database lists plans linked to your SSN with plan administrator contact information; it doesn't charge a fee, and DOL says it will never call, text or email you asking for passwords or codes.
Note: Not financial advice. General information only; check your own situation or ask a qualified professional.
Source
U.S. Department of Labor (EBSA): Retirement Savings Lost and Found Database (opens the original source in a new tab). Check it for the latest numbers before you act.