I can't think of any good legal solutions to what you describe. The car should have been inspected when it was picked up from the restoration shop and the issue identified then.
Did you title the car in your name when you originally purchased it? If so, you might consider checking with the state and see if they still show you as the owner of that car. Not sure how much info they are allowed to share but it could be a starting point...
Did you have the car insured? If so, perhaps you can file a claim. The title would then be converted to salvage or dismantled state which would prohibit anyone else being able to register the car. The insurance company might even be able to check and see if that VIN was titled while the body was in storage.
Sadly, I hear stories like this all the time. No wonder I have trust issues when it comes to letting anyone else work on my cars.
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