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You can use the button off https://www.ftb.ca.gov/online/refund/
You will need your Social Security number, your mailing address, and the amount of the refund.
(Note that this tells you how to find your refund status; even if we knew your SSN, which you are not allowed to provide on this site, I would need a power of attorney to use the provider's side of myFTB to check your refund status.)