I sold a pricey boardgame to someone on Facebook (via PayPal), used InPost to deliver to their house. The game arrived damaged, the box must have been stepped on, so even though the damage on the outside was minimal, it was kind of squashed, the gamebox inside has one of the corners destroyed. Inpost didn't accept any liability insisting not their fault based on the outer box appearance and the fact that it wasn't too bashed up. The buyer now wanted to return the game and won't accept any compensation for the damage. I can't help but think that it not my fault, so why should I accept a return? I sold the game for £80 but once I comes back to me it's no longer saleable in this condition, so should I assume all of the responsibility in this situation, suck it up and accept the return? What would you do?