So, I got some more information on the Chewbacca Map Mystery. One day only on Sunday, March 18th Disneyland put out a Chewbacca cover map with the updated interior ads and the new code of DLP-031618-ENG. Then strangely, the very next day, the park went back to the Pretzel Girl cover with the newly updated code and interior ads. So, it seems we have a one day map and the reasoning behind it we may never know. If you got your hands on one, congrats!
Thank you so much to blog follower Daniel for bringing this to our attention!
Codes are: DLP-031618-ENG & DCA-031618-ENG