Years ago, when I got the original Nexus One smartphone, I'm fairly certain the box it came in contained a small card with instructions on it that was made from

Years ago, when I got the original Nexus One smartphone, I'm fairly certain the box it came in contained a small card with instructions on it that was made from limestone. I can't remember the name of the company responsible but I remember it being printed on the card and that I checked out their website since I was intrigued. I never saw those non-paper cards in any subsequent Nexus packages. Edit: I wonder why Google stopped using them. Or maybe they didn't and I just never noticed since they were so paper-like.