Fraud?

Hello, I’ve already read a lot about it here, but I’m not going to be finally smart. The following case: On our sales ad at Mobile, an interested person from Croatia has registered, who asked for some details about the vehicle and of course negotiated the price. He made a contact with a friend in Germany who should look at the car for him. He also registered and we made an appointment for the visit. The gentleman was then also there and has the A The buyer is therefore a company. The buyer, from whom I have the signed purchase contract, a proxy for a forwarding agent to pick up the vehicle, as well as a copy of the identity card would like to transfer the purchase price. I would unsubscribe the vehicle beforehand. Suppose the money has been received in my account….where could the hook be??? He appropriate hints. Greetings