The first time steam asked for the activation code, I couldn't find it.
In the end, I realized the sticker was there, in the box, just below the disc slot, but it was absolutely blank.
Steam forums are down, I opened a ticket, and I'm preparing to wait...
Ok, I don't expect to find a solution there, but if someone has ever experienced the same problem, it could help me feeling less f...ed up... in a way.
