Hertz was (and still is) a rental car agency, and back in the day they had a “Rent-A-Racer” program (you probably know of it from the 1966 Shelby GT350-Hertz cars). For 1970 they ordered about 100 Cougar Eliminators with the factory sunroof (not sure if they ordered any non-sunroof E-cats). I believe there were only 102 or so 1970 Eliminators made with the sunroof, so basically if you have a sunroof Eliminator then it was almost certainly a Hertz rental car originally. Also, all of the Hertz Eliminators were built with the same options ~ PS, PB, AC, 351 eng, FMX auto trans, deluxe interior, but a variety of color combinations. From the looks of your Marti report, only the California Hertz cars received the CA Emissions.
IIRC, all the sunroof Eliminators were produced around the same time, so their VIN numbers generally fall in a certain range as well.
So, what makes a Hertz Eliminator special? It is loaded, and it has a sunroof 
Plus it is one of those extra “history of my car” things that alot of people love.
Edit - now how cool would it have been if all the Hertz Eliminators had been black with gold stripes? Oh man… I think I just had a cargasm! LOL!