Thank you for your help, my main question would be about its age and how I should store it, if I plan on keeping it? As of right now it's in my safe which has a dehumidifier.
Storing the way you are is fine. The black powder is known to still ignite after a VERY long time. You can soak black powder in water and dry it out and it will still ignite. The real problem with the cartridges is the primer and the copper (I assume) cases and to a lesser extent the lead boolits. If these are black powder they are probably from around the late 1800’s. They could be nitro cellulose powder if not marked as black powder. The cartridge has been around since the late 1870’s.
Smokeless powder came into use around the very late 1890’s to the very beginning of the 1900’s. The primers go bad and become corroded and the cases become corroded. Chances are they won’t go boom or a very small amount of them will go boom due to the primers degrading.
I hope this is the info you were looking for.