I've been in the market for a rMBP and whilst in my local John Lewis a discounted model caught my eye. It was a 2014 rMBP 256GB for £750. Thinking this was too good to be true (I was right) I got speaking to the sales assistant and discovered that the reason was returned by customer as they were coming from Windows and couldn't get on with OSX and they had the incorrect machine in the incorrect box. What was in the box after much confusion over the box and serial number was a '15 rMBP 128GB. My theory is they bought one of each and returned the smaller model in the box for the 256 to get the most refund. So I now have the option of this MacBook for £675 ($1035 for my American minded friends) and I'm sure I could possibly talk him down a bit more due to the wrong box issue. Should I be biting his hand off or would you advise caution over the whole discrepancies?