With so many recent reports of hacks, software theft, and cloud-based security breaches, this "physical world" espionage case seems all the more mysterious.

The Federal Bureau of Investigation is trying to figure out who is stealing stuff from "a Fortune 500 company in Houston's energy corridor." The company's trying to stay anonymous. The man in these photos took several items (physical things!) from the company during non-business hours in 2015. Federal agencies are on the lookout for activity that might indicate attempts to hack America's energy grid, and while it's a long shot, the repeat thefts from this corporation seemed especially concerning.