Quote Originally Posted by BG-57
Yeah there is, although some have argued that it was deliberate on Square's part.

Here it is:

The first Dragon Zombie your party meets in the right path can cast Pandora's Box as a last resort when it's mortally wounded. Every Dragon Zombie you meet after that doesn't use Pandora's Box. Period.

I fought over 200 of them before I found out about this. So save before you try to get Pandora's Box.