I ever since I learned of the seven keys, and the treasure they are said to hide, I am always reminded of that movie national treasure. They hide the treasure as it was too much for anyone. In the movie, part of the treasure was scrolls from the lost library of Alexandria. What if the treasure was a huge library dedicated to western and Grimm? Look at what nick could do with his collection, they could not let the royals keep or destroy them.
If one of the Grimm betrayed the others, why is the treasure unknown?

The first viewer came from the UK