I wish I could direct you to a good site to find out the details. Try using a search engine on 'collecting cartridges'. These are very old, probably late 19th or early 20th Century manufacturer. If the box is fairly intact and has all the cartridges in it (if it is unopened, do NOT open it to see!), you have a 'collector's item' that could be quite valuable. They are .45-70 Government cartridges made on the commercial market that are loaded with smokeless powder instead of the original black powder. They are loaded with a 500 grain lead bullet. That much can be gleaned from the label shown in your pictures. I hope this helps.
The original load was a 400 grain bullet and 70 grains of black powder for rifles and 55 grains of black for carbines. In 1884 the rifle load was changed to a 500 grain bullet. Without seeing more of the box I can not tell for sure, I believe they are 1920s(?) manufacture. The boxes look good and as stated if the boxes are not open don't open them. Even if the corner is open don't open more. In the back of some gun mags there are sometimes ads for boxes.
Gunseller
The best I can do is date the box to pre-1912, as in circa 1911 UMC merged with Remington, and the label would read Rem-UMC. Suggest you try the good folks at IAA with your query. http://cartridgecollectors.org
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