Incomplete Drill Bit Hole on WildCat?

Has anyone seen this before on their Wildcat? I never noticed it before, until I just got my gun back from AOA for leak repairs. The gun is still under the 1 year warranty, therefore, they did the reseal of the air cylinder and regulator housing. So far it seems they did a fantastic job, but the half-drilled in hole and the small dent to the left of it is puzzling. 

I called AOA about my concern and I'm still waiting on a reply. But I thought you might have some feedback.