Uhhhh I don't see a CD key

OK, first off, am I supposed to have 3 cd's or 4 in the case? it looks like there are supposed to be 4 but i have 3. secondly, i don't see the cd key anywhere on the box, inside the case, or on any of the cd's... please help me someone, thanks in advance.

3 cd's. Look under the third cd.

Thanks so much bro. really appreciate it