The mysterious object resurfaced along with the news about the new office. No, it’s not a new self-driving iPhone.

According to the patent filing, Francesco Longoni, the maestro of the Apple Park café, developed the box alongside Mark Doutt, who was a senior packaging engineer at Apple for 10 years, according to his LinkedIn profile.

The company used them in its Caffe Mac cafeterias for people to take pizzas to their desks, and the boxes became such an identifiable aspect of working there that people signed them for memorials to Steve Jobs.

@mantia @panzer the Caffè Macs pizza box is nice and when Steve Jobs died was signed by many Apple Food’s employees

— setteB.IT (@setteBIT)

From the patent: “For example, in order to prevent moisture from being trapped beneath the pizza rendering the pizza soggy, selected portions of an interior surface of a base of the container can be elevated to provide a support platform.”

Apple will use the pizza boxes at its new campus, according to Wired.

It’s also environmentally friendly. The patent filing says the thing “can be fabricated from various types of re-used material along the lines of molded fiber.”

Which is useful for keeping the pizza inside the box during earthquakes, which there’s always a risk of in Silicon Valley.

We may never know.

Check out more articles on!

Blake Montgomery is a reporter with BuzzFeed News and is based in San Francisco.