If he opens a case with ebay he will be instructed to return the whole thing for a full refund.   The odds are he won't want to do that but if he does and there's anything wrong with the item when you get it back you can appeal here:
https://www.ebay.co.uk/help/selling/managing-returns-refunds/appeal-outcome-case-seller?id=4369

@lebar_2123