The workplace break room can be the dumping ground for extra and unwanted foodstuffs. Around here, no matter what it is, it always seems to disappear. You never know what it is or where it's been. It just gets thrown out. The ants and mice take care of it for us.
Some folks are more selective about knowing the reason or source behind the abandoned food.
Or, by the notion that it is there and it is free, so one must eat. Your office vacation photos, and you. Eating out of the carton. Daylight Savings Time. You're all alone.