Next time I'm down there where the speakers are, I'll check the bass bin for any tags. I should probably check the other one as well. That one had too much furniture in front of it. This may be a kit enclosure so it may not have anything in the bass bin. I'm not sure if I remember the story correctly, but I think the speaker were built into the movie theater casework. The enclosure may have been built in the 70s after the speakers were removed.
Thanks for you help on this.