Dealership left a loose bolt?

[Bohemus]

Had a clunking sound coming from the front end, so I took it in to Chapman Hyundai in phoenix. They said a control arm bushing had cracked, which they replaced. The sound was noticeably better, but still had a mild clunking sound when braking and accelerating, especially at low speed. Took it back in, technicians said they couldn't find anything. Came home and heard it again. Decided to park the car and push on the front end to rock it back and forth. Heard something rolling around behind the radiator. Turned out to be a 4" bolt. Assuming the tech never reinstalled it. Anyone recognize the bolt, and possibly where it belongs??

 

[Bohemus]

Took it back into the dealership this morning. Turned out the bolt belongs to a crossmember. They said the bolt probably "loosened over time and worked itself out." I strongly doubt that, if its true it makes me question all of the other bolts installed in this car...

 

[OneFunGenesis]

Wow. It looks like a cross member bolt now that I look at it with that in mind. Those typically don't work their way out. I wouldn't be too worried about other bolts on the car...just the dealership