Wow you guys are suspicious right out the gates, I thought it was just Google translate being a bit clunky, or typing in your second language. I didn't pick up on the wrecked part, which at face value looks a bit iffy
Europen authorities take a very dim view of vin tag swaps, same as the US. Plus there are lots of specialists in Germany and beyond who can put even a properly bent / rusted out car back together. Mittlemotor, Freisinger, even Porsche classic at the factory if you have pockets to your knees
Hope this is a genuine search for a whole car to restore & maybe (for now) cut the guy some slack?