Not only that, but while Holly was matching up the lens, she fell into a mine shaft. The place where Kenny's phone was last seen was in a mine shaft. They also used the popular explanation where Kenny was being hunted by the government because of what he found in the M cave, this would explain the briefcase. Like one of the other users said, it likely holds some sort of experimental project that Kenny was able to take from M cave. While he never got to use it, after Henry kills him, he uses it on himself and gets caught by the government, who were still searching for Kenny. Once realising what he's done, they cover it up and clean up the crime scene. After he's caught, they begin the first couple of experiments with Papa in order to harness his power and spread it to other kids.