there is no eBay buyer protection for things sold on eBay.com.au

for items sold on the au site and paid through PayPal, you only need tracking and proof of lodging.

for items sold on eBay .com you also have to prove delivery.

if you are logged into the au site, then it would be my guess that anything in the selling centre related to items sold on the au site.

if you are selling to other countries, you really need to be cognizant with the terms and conditions for items sold on their sites - so if someone is logged in on the .com site when they purchase - it's their rules..... or the UK site etc etc etc