The Policy on items sold in the Ebay / Paypal user agreement is that they will only accept proof by means of a trackable method. Of course, there is no way you can send Ebay or Paypal proof that the buyer has their item by sending proof of this, as they collected in person.
Photos, signed receipts, photos of their car might be useful for the police, but Ebay / Paypal will not accept this. Try sending a photo of someone signing a receipt in your living room for any disputes, and see how far you get
" You can photograph the buyer collecting the item, video them, get half a dozen neighbours round as witnesses, take DNA samples and yet none of this will be acceptable to PayPal and offer you any Seller Protection at all.
Nor will the advice offered to accept a PayPal Gift payment - you can stil get hit with a chargeback.
To meet the most basic criteria with Seller Protection, you are required to ship the item by trackable means to the address PayPal provide you with.
If you cannot provide a tracking number to prove delivery, you will lose a dispute and could get hit with a chargeback months down the line (you'll pay £14 as an admin fee for the privilege of losing your money and your item too).
It's all in the PayPal User Agreement in black and white. "