Need advice and also a warning.

superbee6, have you physically seen the car and checked the VIN?
The 3 main VIN locations for your '70 Challenger are the plate on the dashboard, on the top of the cowl just to the driver's side of the wiper screen opening, and on the top of the radiator support.

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My '69 Dart also had the VIN stamped underneath the rubber trunk gasket but I'm not sure this location carried forward to E-bodies.

When I first purchased the car, I was pretty sure we checked that. I can't remember for sure, it was so long ago. It is something I would do. Since the VIN "mixup" and he's provided me with a title of a different VIN and new BOS, I've only been able to see the cowl number. and by picture only. I can't get access to the car. He claimed that the rad support VIN was not there but that the factory was inconsistent in placing the rad support VIN (I think that's BS). He claims that the car has never been wrecked and the rad support replaced. The dash pad was in "storage" so I haven't gotten access to that either.