Go for both I say

But first, have all info ready for the questions they will ask

Were the sellers registered in Australia? 

Are you on the app or the real site?

Was the 'free' shipping referring to local pick up?

If the seller(s) were not in Australia, was the 'free' shipping also for international sales?

Do you have the items numbers you can share?

If you want an eBay answer. you will will need to ask eBay