Pandora Pondering

What is in the box?

If Pandora's Box was opened
would there be treasure or misery within?
Or could it possibly be a bit of both,
some heaven amidst the sin?

Would all our dreams escape that chest?
Would our nightmares do the same?
What is the mystery behind this crate
that brought it to such fame?

Written for: "EXPRESS IT IN EIGHT " 
Prompt: Picture of Mysterious Box
Line Count: 8