Thanks for all of the interest. I am a bit behind because my internet has been down...but now back in business. I submitted it to the link for pattern ID today and will keep you posted.
The bowl is four and 3/4 inches deep and yes, I think it is too heavy to be a box enclosure; it weighs 1.15 pounds. I don't have any others that are remotely like it. I have sold most of them but definitely know there weren't any similar. I am attaching a better photo of the entire glass if that might help.