Battery Jars or Aquariums?

I picked these up at a local barn sale yesterday, I think they might be antique battery boxes, but there isn't any markings on them to indicate that. Last winter when I bought a box similar to the medium sized one at a different sale, I went online to research it and I came to the conclusion that unless they had the markings of the manufacturer, they weren't battery boxes. Have you heard that too?

Do you know anything about glass battery boxes? Are these battery boxes or just glass aquariums? Wouldn't they look awesome filled with vintage ornaments in the middle of a buffet or table for Christmas?!?!