It's really hard to tell by the box what genreration you are going to get. It seems that these generations vary and are not consistent with the higher numbers. The best bet is if you go to best buy check the case before you buy it. The pillow effect is when the screen doses not sit flush with the screen and you get air pockets on the screen in between the lhone and screen saver.
Typically what numbers are we looking for? Around 190k+? Because I don't wanna go to best buy either and open every lifeproof case they have.