Last Friday on the way back from getting my tracking done there was a huge bang under the car i stopped and walked back down the road to find this. i assumed i must of ran over it and it hit the bottom of my car.

Today on the way home from shopping again a big bang under my car, but the road was clear and i stopped walked back down the road to find this. The both slot together like a puzzle.

What are the chances the garage left them attached to my car after doing the tracking? its a 18mm socket :-/ or am i just really unlucky?