But seriously folks....
I'm always amazed at how people drift into the kitchen or snack area, spot something potentially yummy on the table, and chow down without a second thought. Admittedly in companies where you can get to the snackeria easily there's not much incentive to cause trouble unless there's a personal vendetta, whereas companies that might deserve a "run" for their money are pretty good at restricting outsiders, sometimes to the point of offending potential clients (like a certain formerly large USA photographic corporation).
On another note a quick glance at the Glassdoor entry for the company in question indicates a certain amount of internal dysfunction. Perhaps the incident was the canary in the coalmine.