Vision: If you are looking at or owning a crate: you might become wealthy. Looking at an empty crate means the opposite: poverty and worries are knocking on your door. See Box.
To dream about a crate suggests that you are trying to preserve and protect some aspect of yourself.
The crate may also symbolize your limitations and restrictions.
If you opened the crate, things are being revealed about yourself that were once hidden. Consider your feelings in the dream.
If you were filled with fear as you opened the crate (or if there was something scary inside of it), you might be nervous about people knowing/liking the “real you”.