Out of all things that people expected from Black Ops 2 release, it’s a safe bet that they didn't expect this weird part. Some of those who have bought the physical PC version of the game, report that they had received a Mass Effect 2 disc labelled as a second part of install. As game activates on Steam, there is no problem finishing the second part of install over the internet, so buyers can still play Black Ops as soon as it downloads. The reason for the disc mismatch is unknown; it’s likely that the same disc factory was also manufacturing Mass Effect 2 discs before. Activision has responded on the matter, providing information on installing without 2nd disk and started investigating the matter.

Stay tuned, we will update the news if Activision provides further info on the matter.