Regarding out of state registered vehicles, California law states that "Vehicle registration fees are due immediately upon accepting employment or establishing residency in the State of California", and you have "only 20 days to complete the process of registering your vehicle without paying a penalty".
There are State employees that look for vehicles with out of state license plates, and there is even an online form (to report out of state license plates) that can be filled out by anyone and sent to the DMV.
John
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