Just looking over the EFC rules I came across this:
The weekly rewards are distributed every Sunday, just after midnight (Paris time).
The seasonal rewards are distributed at the end of each season.
The daily wins will vary from day to day as they will be randomly distributed. You will be able to win XP, Clintz, cards, credits and Tokenz. AND THROUGH THE PRIZE DRAW, you may win all or part of the above-mentioned rewards.
I believe it's the random system that dictates the contents of the daily and EFC boxes. You don't always get all five of those things, but you might only get BP, clintz and tokenz on one day, for example.