From a professional seller.Just because it shows uncomfirmed does not mean it is a scam. Since the sale is through PAYPAL the buyer has buyer protection and you have beeen furnished an address that was the address the buyer entered as his address when they registered their account with PAYPAL.
Have you done an online search for the buyers address? Have you e mailed the customer and asked him to verify the shipping address. I can go on and on but, you probably have the jist of it by now. Remember the party has asked you to sell to him. He has given you money which you can verify through your paypal account.