[private]
Hm. So they must have also been watchers or guardians of a sort.
I'm not familiar with puzzle boxes as dimensional doorways, even if I find the concept fascinating. I would very much like to study such a box under containment conditions. It might operate as a doorway to get back to one of our dimensions, or entirely backfire and open a portal between the two. How delightful. If one should mysteriously arrive like other items from dreams seem able to do, might I scan it and take readings for internal power sources? Under your supervision, of course.