"Mr. Kiesselhorst provided a check in the amount of $8,100.00 which could not be deposited until July 23, 2006."
http://www.newschannel5.com/content/investigates/BHstatement.pdf
Sorry I missed that. But that same papragraph referenced the sales' manager or some such's acceptance of the deal. Also there are many reasons for a postdated check (paydates and such). The dealership's use of the term implied acceptance of said item as a condition of the sale (in other words they knew about it). Now it may well be that it was meant to be a downpayment (It sounds like that too me).
But the buyer: Still pursuing this, also indicates to me a sense that he felt he was wronged and is not just some guy out for a freebie.
One thing I'd like to know is how long Heard has been in business. Generally speaking long-established businesses don't all of a sudden resort to cheating (absent a change in management or ownership).