Inside a crate on level 1, you find
An impossibly dense rubber(?) ball in a cushioned box with the note: "DO NOT DROP!" written in trembling letters.
Though golf ball sized, it weighs approximately twenty five pounds (11.3kg), and never bounces. Every time it's allowed to hit the ground from any height, there is a slight tremor with no immediately discernible effect.
There is a journal included, indicating various points on the globe where the balls has been intentionally dropped. To re-stabilize the Earth's orbit. Further records indicate a past attempt to remove the ball from Earth entirely, wherein it tore through the shuttle's hull in the stratosphere, and relocated our planet entirely. There is also a diagram of the unnamed galaxy Earth was originally a part of.