Something fell off Boardman Team Carbon

rodofgod76

Took my new Team Carbon out for its first proper run yesterday, and whilst going over some bumpy stuff I heard something metallic hit the crank but thought it was road debris. When I got home my mate noticed a cover on the left hand crank was missing, revealing what looks like an Allen head where you'd remove the crank arm. It's an FSA Gossamer chainset.......anyone know if this cover is part of the crank retaining setup? Bike is two weeks old, guessing it wasn't fully tightened at Halfords.