Don't have my game client open right now but, if I recall correctly, I've opened around 28 containers. I only tried my luck one day (all 3) and, each time received only 5 "meh" flags. The rest of the time, I've exclusively selected the signals/camo option. I have to say, I've been rather pleased with the payouts here. Loads of (for the most part) useful flags, tons of free xp, and a fair amount of good camos and other assorted consumables (type 2). I've even gotten a super container with 100 Dragon flags. Frankly, I'm not sure it's really worth going all in for the "luck" option and, I believe I will be sticking to the signals/camo type.