You can attempt to contact the bank that issued it. If the bank no longer exists, it's possible its deposits were assumed in a merger or acquisition. You can research what happened to the bank and obtain contact information using the FDIC's "Bank Find" service.
Once a CD is paid out, a bank does not have to maintain records of the old account. Five years is the minimum requirement, and if an account remains unclaimed for a number of years (two or more, depending on the state), state law on abandoned property may compel a bank to surrender the funds to the state's unclaimed property offices. One place to try tracking down funds that have been surrendered to the state is www.missingmoney.com, an official, free site sponsored by the state custodians of abandoned property.
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