Hello I want to sell a old iPhone for a friend! But I don't want to be scammed from buyers. How can I protect myself? I was going to have it shipped by USPS with delivery confirmation with signature required. Also I was thinking of taking pictures of the contents in the box and make a video with me taping up the box clearly showing the time and date in the video. Is there anything else you guys recommend I do? I want to prepare myself with enough evidence for eBay and Paypal! Thanks!