Sounds like you were lucky it fell out where it did, and that you found it! I'm a little surprised that bolt came loose though, the bolt on each side threads into an aluminum bar that goes into the front arm of the suspension, and they do have some sort of thread locking compound on them from the factory, if I remember correctly. There is a plastic bushing on each side that goes between the aluminum bar and the tube of the suspension arm, and it has a flange that takes up the remaining space between the suspension arm and the inside of the tunnel. I'm thinking that maybe the bushing has broken apart, allowing a bit of a gap in between the arm and the tunnel. With no tension on the bolt, it could potentially loosen up. Even if the bushing is gone, I don't know that it's worth worrying about, but might be something to remember checking out though, if you ever pull the skid out.