Hi Harry
I've seen the offending article. It's an Atlantic vinyl test pressing rather than an acetate: Atlantic logo, laminated white label, neatly typed credits and recording dates. I think James Trouble has or has had another Nate Adams Atlantic TP: the instrumental of Herman Hitson's "Yes You Did": I think he may have got that off Sam. Maybe James can confirm? That's from the same session as his released Atlantic 45, "Why Is It Taking So Long", which is a great cheapie if you don't know it. As to why Richard covered it up, I can only speculate that it was at the insistence of his supplier, presumably John Anderson. Many of these Atlantic TPs are not one-offs, and that would provide a perfectly logical reason to cover this one up.
The Herman Hitson version released on CD a few years ago is quite different, definitely a different band take and a much rawer, looser version of the song. It seems to have been producer Johnny Brantley's method to have as many of his stable of artists record as many versions of the songs of his main songwriters, Lewis, Farmer & Lewis as possible. Maybe there are further takes of "Love Slipped Through..." or "You Don't Mean It" by the likes of Lee Moses waiting to be found on shelves somewhere. Here's hoping!