This might (or might not) help (buyer T&Cs for the GSP) : http://pages.ebay.com.au/shipping/globalshipping/buyer-tnc.html
Found the bit covering lost items, so copy / pasting it here:
Lost, Damaged, or Undeliverable Items.
If a GSP Item that you purchase is not delivered to the delivery address specified by you, it is damaged, or it does not match your Seller's description, your purchase may be covered by a PayPal Buyer Protection program, as described below.
PayPal Buyer Protection.
Your purchases of GSP Items using PayPal are covered by the PayPal Buyer Protection policy applicable to your use of the PayPal services if your purchases otherwise meet the policy's eligibility requirements and conditions and do not fall within an exclusion or coverage limitation. The PayPal Buyer Protection policy applicable to your purchase can be found in the PayPal User Agreement and is governed by the applicable PayPal User Agreement's terms. If you are eligible for PayPal Buyer Protection and PayPal finds in your favor on a claim stemming from your purchase of a GSP Item under the Program, the applicable coverage amount will include the Program Fees that you paid for the GSP Item.
Risk of Loss. Notwithstanding any of the foregoing, as between you and your Seller, the risk of loss or damage to a GSP Item shall remain with your Seller until the GSP Item is accepted at the U.S. Shipping Center. As between you and Pitney Bowes, risk of loss or damage to a GSP Item shall transfer to you from Pitney Bowes and/or its third party parcel processing service providers when the GSP Item leaves the U.S. Shipping Center. However, your purchase may be covered by the PayPal Buyer Protection policy.
Undeliverable Items — Valid Delivery Address Required. The delivery address that you specify must be within a country eligible under the Program and must be a valid and complete delivery address. The delivery address that you specify may not be a Post Office (P.O. Box), Army Post Office, or Fleet Post Office. eBay and Pitney Bowes shall have no liability and shall have, in their discretion and in any manner that they prefer, the right to dispose of or liquidate parcels (and their contents) that eBay or Pitney Bowes conclude are undeliverable, for whatever reason. If eBay or Pitney Bowes conclude that a parcel is undeliverable and elect to dispose of or liquidate a parcel, title to the parcel (and its contents) shall transfer automatically from your Seller to eBay, Pitney Bowes and/or any third party designated by either eBay or Pitney Bowes (as eBay and Pitney Bowes may elect), at no cost to either eBay or Pitney Bowes (or to any third party designated by eBay or Pitney Bowes), and eBay and Pitney Bowes (and any third party designated by eBay or Pitney Bowes) shall retain all proceeds (if any) received from the disposal or liquidation of the parcel and/or its contents). eBay or Pitney Bowes may also elect to return to your Seller any parcels that eBay or Pitney Bowes conclude are undeliverable. eBay shall not be responsible under the PayPal Buyer Protection policy if eBay concludes that a GSP Item is not deliverable to your designated delivery address for any reason, including because the delivery address that you provide is incorrect, incomplete, or inaccessible. In addition, certain third party shipping carriers utilized under the Program may require that the designated recipient of a GSP Item be present to receive delivery; where in-person delivery is required, you shall be solely responsible for ensuring that the designated recipient is available to receive delivery.
Transfer of Title. Title to a GSP Item remains with your Seller until such time as the GSP Item is successfully delivered to the designated recipient of the GSP Item, at which time title to the GSP Item shall transfer to the designated recipient. At no time do eBay (or its affiliates), Pitney Bowes (or its affiliates), or the third party logistics providers, shipping carriers, customs brokers, freight forwarders, or other subcontractors under contract with Pitney Bowes take title to GSP Items, except as otherwise provided herein.
International Returns. The returns policy specified by your Seller in his/her listing description of a GSP Item will apply to your purchase of the GSP Item. For GSP Items that you return to your Seller, you will not be eligible for, and you will not receive, a refund of any Program Fees that you paid to Pitney Bowes. You may have additional rights under local law.
