Never allow a buyer to pay by Paypal and collect in person. If they did, they can claim a full refund from Ebay or Paypal if they say they never received the goods. The only proof accepted by Ebay that a buyer has received the goods is a tracked delivery that has been signed by the person receiving the goods.
If a buyer wants to collect, only accept cash. If they've already paid by Paypal, only send it by a tracked and signed delivery service.