Not only that, but this "Kingston" drive is only 40G compared to 160G!
I just looked over the packaging again and everything looked to be in order. There was a sticker over the anti-stat bag that had the serial number of the drive on it. When I ripped that sticker off, it came apart and left tamper-evident markings on the bag. I can't see how someone would've been able to swap out the insides (like people on another forum are thinking happened), unless it happened directly at the factory before it was packaged...
I've already contacted Amazon and I'm hoping someone from Intel can help me here - I can't seem to find an email address, but I suppose I can call them tomorrow as well.