I just had to do the same thing today! I was so mad that I had to do what they should of done in the first place when they were investigating! I did fortunately win my dispute after I provided the information from the post office. I also told them about all that I read in here. They need to ban them!
PayPal credit me after I showed them the letter from my local USPS office that stated, “The tracking numbers you provided did show items were delivered, however neither was delivered to your address.” With that I said to PayPal CREDIT ME NOW AND I STRONGLY SUGGEST YOU GO AFTER THIS COMPANY AND CREDIT ALL THE PEOPE ON YOUR COMMUNITY BLOG THAT ARE IN THE SAME SITUATION I WAS. They are supposed to protect our purchase and not make life worse. Go to USPS.com and fill out the proper forms and then since a screen shot of my email wasn’t enough, PayPal wanted me to jump through one last hoop and get the letter! Do it!!!!!!