The faceplates in the bays have mesh inserts with dust filters which can be taken out for cleaning. There’s also a funny gadget in the bottom bay:
You can use this box any way you wish.
On seeing this box some people say it’s an ashtray and others suggested various small things could be stored there. So you can really use it as you think proper and if you like it much, you can even purchase another such box separately. The Power and Reset buttons with two LED indicators are located in the top faceplate:
But the design of this system case allows putting this faceplate into any bay on the front panel. The side window is nicely shaped, too: