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There are likely regs in effect in your state that mandate notification to the consumer of the reconciliation of debt remaining after a repossession.
I would begin by contacting your state or local agency that regulates repossessions.
They should be able to provide you with detailed requirments.
If you cant determine the specific agency with jurisdiction, you might begin by calling the office of your state attorney general.
They regulate and prosecute violations, so are usually aware of the pertinent agency for a given area of consumer debt.