When a box is opened, previously hidden items are unveiled. So, this dream can be a symbol of intellectual exploration because you are discovering the contents of your psyche. If what you find in the box displeases you it may refer to your fears or aspects of yourself that you want to hide. In case of a safe, what you keep in there will be your most precious intimacy, possibly, your best qualities. In the Greek myth of Pandora's box, the malignant part of the woman who wants to have everything is represented. The oneiric-psychological analysis of this story establishes it represents man's fear for the dark and feminine side of his nature. It can also refer to the way the unconscious projects the complex and negative attitudes in real life. If you force a safe in order to open it, the omens say you will not marry the person you currently love. If it is empty, you will get married soon; and if it is full, late.