Royal Mail don't do second class packet posting. The longest they do is express 48 (correct me if I am wrong).
It seems he has not been online since the payment was made. If it was me, I'd be looking into seeing if I could contact them by other means, or possibly even a paypal dispute. I may be jumping the gun here, but it does look a little dodgy. Even the slowest couriers usually take less than a week.
Although saying all this it may be more beneficial to wait a little while longer, what with post being delayed by the Christmas rush etc