What you have wished for might be an impossible task. State motor vehicle departments seem to not have cross reference records that date back before the age of computers. The VIN number is a starting place to do any investigations. Titles are hard to track particularly if car was transferred to your state. Also I know you can get the Data Card (now for a fee from MBNA), it might tell you where the car was imported to. I have a european spec SL and the data card tells which MB owned dealer in Germany it was delivered to. As for the dealer invoice, again would be hard to locate this. If in fact you find out who the dealer was, could be in a archive at that dealer. Bottom line, Mercedes Benz North America will have no info.