Warning from the stars

A story about flying saucers: IT WAS a beautifully machined container, shaped like a two pound chocolate candy box, the color and texture of lead. The cover fitted so accurately that it was difficult to see where it met the lip on the base. Yet when Forster lifted the container from the desk in the security guards' office, he almost hit himself in the face with it, so light was it. He read the words clumsily etched by hand into the top surface with some sharp instrument: