So the lady signs it when she sells it to this guy, but this guy never registered in his name? Did HE sign it? If he didn't sign it, you sign as the buyer and register it, and Florida never knows that he owned it. If he did sign it, he needs to register it with the state in his name, get a title in his name, then sign it over to you. Or you need to get ahold of the lady, have her file for a lost title, then she can sign it as seller, you sign as buyer.