UNKNOWN is what a reporter typed when they did not catch the number. These are 2 separate incidents involving different vehicles, not a record of one driver — so there is no corroboration status to give, and nothing here can be matched to a plate you are looking up.
There is nothing to add to UNKNOWN — it is not a vehicle. If you have a plate, even a partial one, start there: the lookup matches fragments, so four characters is enough to find an existing record.
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