I have no idea why they did that. I have used sheet rubber to make splash guards, but not going to help with dust. If I had a pic or one in front of me, I might have a better solution for you. I have been looking for a shallow box for my outlander max, but no joy yet. I think your best option is to find a box to put on the back or front rack. Planio made a rear box that fit the older outlander maxs if you removed the hand holds. The storm is the nicest ive seen so far.