Posted 13 September 2012 - 21:55
The key is on either a manual or on a sticker on the casing. For me, it's on a white sticker just above the CD. Look for a sticker that might have fallen off and gotten stuck somewhere. (EU version (GB), standard CD/DVD-case with one DVD inside and then stuck into a fancy piece of paper casing.
Bring it back to the shop. If they somehow can figure out which key it actually is, they'll lock that key. You/he should get a new one. Otherwise, I don't know. They (the publisher) must have a way to tell which key is bound to what box/CD. Maybe some psychopath stole the sticker. Or, the shop got screwed and got sold lots of invalid Starcraft-boxes that lack keys.