hello eBay community,

i have sold two computer central proccesors(CPU) to a user, after 2 weeks he responds i just received first cpu today i didnt get second when really the item would have arrived 3 to 4 working days why two weeks anyway i had faith that he would not screw me arround and send it via Large letter envelope padded now these dont have tracking how ever i have a receipt and possibly video from the store me walking in to send it! is there anything i can do about this?

he openned paypal case and i sent whatever proof i have of this to them theyre still deciding how ever he left me 2 negative feedbacks although he even received first one 100% and second one he also received 100% because i have his gumtree listings and same day he claims that he didnt receive he happened to put that CPU in a pc to sell 

please help and guide further actions i can take