There are a lot of extras in L.A. Noire. For example, if u pre-ordered the game like I did, you will get pictures. All thepictures I believe are hints of where you can get the police badges. These are one of the many you can find. This add-on is called the Badge Pursuit Challenge. If you were the first one to find all the badges you got a lot of money. I tried but failed because I didnt understand the pictures that came in the case. I belive they were the famous landmarks in the game. If you can find them and you know where they are, comment on my blog. I will add something new every week and will have discussions on achievements, the ending, or Q and A's, etc.