Returns are a tricky thing. That's why I put a return policy on all my posts. That way if the buyer doesn't follow one of the policy rules I can deny. There's only 2 reasons I accept returns, damaged in mail with picture and only if the item is damaged not just the box. And if its clothing and it doesn't fit. But on all returns I must have pictures and all original packaging and in my hands before a return is ever accepted.
I got burned on a iPhone not long ago. Guy bought it then returned it saying he couldn't get the service he wanted. Got it back it was his broken phone. Not even the same model, eBay did nothing but bounce my checking account because I refused the money back. That's why I select no returns option. And put a small one in my post out of eBays ruling reach.
As far as eBay making you give the money back they cannot. When you select the no returns accepted that means no returns. But you can choose to put your return policy in the post. Like I said I take back for 2 reasons and that's it.
The only way eBay can make you give a refund is if its a illegal product, or misrepresented to the buyer. Example picture of Xbox but selling as titled xbox1 inbox. That's misrepresented. But I've only has one item ever returned and that was that iPhone. Just posted another phone and put in the posting absolutely no returns accepted no matter what due to scams and software copyrights. Not even damaged, unless the box is tore up from hell, the. Ill get my money outta th po. But not unless I have pics of it unopened, In other words box shows up damaged it states take picture do not open.once box is opened no returns. Be aide of people scamming.