On the CD Sleeve.
The CD Key is the 16 digit number found with the box that the CD came in. It is needed to install Wrath.
the code should be on outside of the disc case after you've already opened the box
it is the set of digits and letters that will come sealed in the world of warcraft box (DVD game) and you should enter it on the world of warcraft account management
If you mean online upgrade, like from a trial account see the related link titled blizzard online upgrade. If you mean something else, then please flag this answer and check the more detail box and add what you mean.
There is no code box!
what is the code for the converter box
a box, you have to have the code to get in it (through it), (pass it) etc, etc.
When you sign in, below the box to type ur password is the code box.
There is no code!
A registration code comes in the box, it is unique for each box.
Twin Box is 75 " Long King size box ix 80" Long However they are the same width. (king size take 2 boxes)
the code is HOBBIDIDANCE in the secret code box