We have moved the Mystery label series to its own menu item on the central bar. There is a lot of congestion on the blog and important stuff disappears very quickly. In the next week, the Spot the difference and Size really matters will also appear only through their menu items. We will see how it goes.
The earlier labels in the series especially those that are unresolved have been put there and there are additional entries 9 and 10. We really are keen to get responses from as wide a range of people as we can, so if we think it is likely that you can contribute, we will be asking you directly.