You get all 50 cards in that box- all together,not separately (and than you use these cards same as album - you can aplly your double stickers on cards). Only difference is that album contains 250 stickers, while only 50 of these 250 can be aplied on cards too.
How you can get that box with cards:
1. collect corners/triangles wich you see on stickers (coners of image where you see number) , sticker numbers 1-80, and attach them on a coupon wich you will see at the last page of ZC2016 album) . When you callect all 1-80 send it to publisher (Kras ,Zagreb ,Croatia, and they will send you cards.. I am not sure does they send to France, but they send them in all countries where they sell albums..
or
2. trade with me on this site :) I have one box with 50 cards:)
or.
3. buy these cards on internet...