Is this Hubley or Not?

I bought this and another piece of cast iron at an auction. It looks like a Hubley. I is old cast iron because of the weight and dark color of the exposed metal. It is approximately 5 inches high. I think the key is inside. I dropped it when I got it and almost, maybe did cry. I can see the lines both sides of the chest but there area no visible screws, which I have seen on all of the other pieces that I have been able to research. Also, the bottom opening is round, not square. Any help would be greatly appreciated. I think this may be my new addiction :)