Howdy, Modoc! FYI, the GLFMC (Great Lakes Freight & Mining Co.) posse shoots near the town of Modoc, Indiana.
Yep, you stumbled onto some oldies. If you didn't already know, the R-P headstamp on modern Remington cases stands for Remington-Peters. Since they've been loaded and fired at least once, you might wish to load 'em up and fire them once with a mild or typical Cowboy load. I'd then put them away and not wear them out. They may not be worth much to a true collector (I don't personally know), but to someone like me, they'd be worth a few cents just to have as a curiosity.
If you DO decide to reload them, I'd lube those cases up so as not to scratch the nickle any more. If they're already scratched, then don't bother oiling them; once more won't hurt 'em, and if the cases and your resize die are clean, your carbide dies won't scratch 'em anyway!