I recently had some work done on the cooling system on my '05 Denali. I opened the hood today and noticed that the engine cover that says "Vortec 6000" is completely gone and the other two covers are loose. The mechanic says they never touched it... I'm losing my mind over this cause I can't believe I wouldn't have noticed when I originally picked it up. So what's more likely, the mechanic is full of shit and I wasn't paying attention? Or someone came by, popped the hood, were trying to steal something under the cover, took the cover, and then closed the hood?