Zeus gave it to her.
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No, it's a myth.
Pandora got her box from Zeus, the king of the gods. Zeus warned Pandora not to open the box. But Pandora was a very curious person who liked to learn new things and didn't like to be told 'no'. So...
Pandora's box contained all the world's evils...and hope. So if Pandora had a "companion" in the box, I would say her companion would have to be hope.