I have bought one - it finishes the case off nicely. It is a metal mesh with magnetic strips that fills in the space on the top of the case.
Ordered from the UK website and arrived by DHL a couple of days later.
Here is a link to a pic on google drive.
https://drive.google.com/file/d/0Byxg3l21bYhqTmpON3R0T1RUU1JmTHN4OVlBbHhrVjlHSlNz/view?usp=sharing
Hope this helps
Tim