LA Noire game question

I finished over 40% of game and i still have 0/50 film reels in statistic. I am not sure what is that. I know it is nothing important but i would like to know.
Answer #1
those r hidden collectibles
if you want to find them all heres a guide
http://www.gamesradar.com/la-noire-film-reels-and-landmarks-guide/
map
http://www.powerpyx.com/Assets/Maps/L.A._Noire-Gold_Film_Canisters.jpg
video
http://www.youtube.com/watch?v=q8QJ-MZNxMk
Answer #2
thanks for your help