I've discovered why Play doesn't charge for postage and packing - they hardly bother with it! I had to send back the X-Files Season 6 DVD Box Set I ordered a while back because it arrived all smashed to bits. It's hardly surprising really when you consider how badly protected it was - just one tiny padded envelope!
I received the replacement today, and although it wasn't smashed to bits, it was still dented and scuffed a little. I won't bother sending it back this time, though. However, what I will do is not order from Play ever again until they start protecting their shipments better. Amazon shall be getting my money instead.