For being honest enough to return our fuel cap

Story goes my dad used the Benz last August 30. He refuels at said station. Today (September 5), I was using the Benz and noticed that the rear quarter panel was drenched in diesel. So I checked the fuel door and noted that the cap was not in place. Checking the credit card receipts, we traced that it was last refueled at said Shell station. My dad drops by this afternoon and gets cap back.

How the cap got left there is still a mystery. But at least they returned it to us without drama.