Set screw in headlight

I’ve had my tundra for 18 months and this set screw just appeared in my passenger headlight. Any ideas where it came from?

 

My guess is from somewhere in the headlight since it's sealed. Broader pic of headlight so we can see what type? It was probably holding a shield or reflector.

 

Sorry no other pics.

It is a stock trd pro headlight.

 

For kicks and giggles, I went out and looked at my headlights and they have no such feature.

Very odd. I can't even tell where such a screw might have come from.

 

Top outside corner of headlight assembly.

 

Here are additional pictures. Can’t find an open hole with no set screw.

 

One of my headlights had condensation inside. Replaced under warranty. Good luck. D

 

I guess it's possible the set screw with no home simply fell in there during the manufacturing process. I'm sure even robots occasionally make is a mistake.