With no feedback on the seller you need to be very careful with such an expensive purchase.
1)Talk to the person on the phone.
2)Ask for proof of ownership. Ask where they bought it and speak with the person that sold it to them.
3)Get good digital photos of all sides of item showing the serial number
4)Call the police in the sellers city and ask if they have a history with this person.
5)Use an escrow service.
If they are legit, they will understand your concerns. Good luck
1)Talk to the person on the phone.
2)Ask for proof of ownership. Ask where they bought it and speak with the person that sold it to them.
3)Get good digital photos of all sides of item showing the serial number
4)Call the police in the sellers city and ask if they have a history with this person.
5)Use an escrow service.
If they are legit, they will understand your concerns. Good luck