Okay - I haven't had this issue for a year or so, and I only ever had it with the USA and Ireland. But - what I used to be able to see was a box you could press to say 'could not send a label' or something like that. I would press that and then email the buyer saying "so sorry, because I am too small a seller for an international account, it is impossible for me to buy a label in your country so please get a postage quote". Then offer to pay the buyer via Paypal (or a mutually agreed way) as soon as you agree the postage quote and the buyer shows the photograph of the receipt (showing your address).
Fill this in on the ebay return case page: "I have reached out to the buyer to pay for a return label". No matter how many excuses the buyer makes for not being able to purchase postage, get a quote etc etc you must reply to every message saying something like "I am reaching out to help you return this item." Never leave a message (whether within the case or just ebay messages) unanswered. If the buyer seems to be waiting for the case to 'time out' to get a free refund, make sure you ring CS to get a block on an automated refund.
This has worked for me on all occasions. Most buyers decided to keep the item after all - a couple did return at my expense. Usually, as well, with the increase in communication you will get a clearer idea to whether a buyer is definitely trying for a freebie.
Worth a try anyway?
