Don't even worry about that stuff until you have your money. If you get your money, even +$100, your feedback should describe your experience. Leaving positive feedback because of that would be like accepting a bribe. You deserve, if it is real, the extra money just for your time and trouble alone. He is, as you know, doing you no favors, and is probably still thinking of himself with the $100, concerned only with his feedback. Tough! Should've thought about that before he jerked you around. To be honest, I'm still worried that you're getting a story from this guy. Did he pay to overnight it? Don't let him weasel his way out of the notoriety he's got coming to him. Your feedback can mention the $100 if it's there, but should still be negative all the way. Good luck!