Sales Agreements: Car Buyer Stopped Payment on the Down Payment and Returned the Car

My question involves a consumer law issue in the State of: If a customer purchases a vehicle, signs all contracts, leave's a $7000 dollar check for a down payment and takes possession of the car, then turns around and stops the check and returns the car a week later telling us her husband did not like the deal, can we legally report this to the credit bureau as a voluntary surrender?

Sales Agreements: Car Buyer Stopped Payment on the Down Payment and Returned the Car