I bought a set of them years ago after I'd spent a good deal of time studying the Tunney cards. I was able to compare them side by side and I am 100% confident that I had genuine cards. BVG slabbed them for me at a National quite some time ago. I've sold them off over the years except for one I kept for my collection, the gum-hat one.
I've handled enough genuine Tunney cards that I would be fine buying a Ruth but it would have to be raw so I could make the determination myself.