I also did this.
But I was just being and idiot f*cking around taking shit off and putting it back on, anyway..
Put the cam cover back on and had a really bad noise (belt rubbing on bolt, I'm pretty sure)
Quickly turned car off and tried to fiddle with the bolt (tight, loose etc.) and nothing..
Ended up just removing the bolt, was on top left corner when standing infront of car..
P.S.
My CAS has a Mitsubishi sign in the middle. Anyone got an answer for that?