I haven't checked for my new card yet...
But I remember when I got my JGC welcome kit with luggage tags and everything, I was really shocked to see they sent it via Media Mail. Which is a heavily discounted form of mail that is meant for sending heavy paper prodcuts (e.g. books, magazines, etc). Not for things like luggage tags and passport holders :X
I figured JMB was trying to save some $$$ by "mislabeling" my mail.