Hi Dad -
I am always astonished about your lack of experience but the firmness of your statements!
If you really have an overview of the development and technology of Niello boxes in Russia, then you can see at a glance that this is a clumsy forgery. I have therefore shown photos of fakes and authentic objects to show the differences to the inexperienced observer.
Please just compare the images - style, sujet, technique, quality, markings etc. are just phantasy = fake!
Just one example: please have a look at the "background":

This "pattern" you will not find on real pieces - it is always a vvv or xxx or sunburst like pattern.
Here some different other objects to compare - maybe you can see a difference!











Regards
Zolotnik