The Secretary of State should have a list of all of the NPO in California. You can also contact the attorney general's office or the local police department if you believe the person is involved with perpetrating a fraud. Best of luck.
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In addition to contacting the Secretary of State and the Attorney General - you can do a simple check on Guidestar.org.
If that doesn't show anything, I'd check the IRS Business Master File or use their Select Check function before assuming malfeasance.
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