Don't fret! The case for your AstroBox was painstakingly laser cut from acrylic sheets. The buttons and light-tube (the plastic that the power light shines through) are also all cut from acrylic, then inserted into the case.
If you shake the AstroBox you will hear these buttons rattle a little in their laser cut holes.
There is nothing wrong with your AstroBox, it's just a super cool laser cut case that makes a little noise when you shake it... In future versions of the AstroBox we'll create a different button structure.
Oh, and lastly, why are you shaking your AstroBox anyways? LOL.