The NRPI expression is something I first heard about on the HBO show Succession. Does that phrase have a history of use before that show? If I google it, I only come up with hits for the tv show.
I hadn’t heard NRPI until Succession but I’ve heard NHI for “No Human Involved” in the context of crimes committed against sex workers. The only thing that comes up on Wikipedia is the name of a CSI episode though so I’m not sure if it’s a term that’s actually used by police. I would hope not.