Jim, I wasn't aware that this type of box was patented by Diss; I had always thought Lee himself patented it. I knew that Browning didn't come up with the idea. In a way, I'm a bit disappointed that Lee himself didn't come up with this idea, but, then again, most of the so-called greats had others working for them.
I went into my "deep dark storage vault" and dug out my '82 and '85 RLs, One of the mags has four patent dates on it.* Are these the Diss Patents? They do definitely hold the cartridges in place out of the gun, though.
*Look like: "Patented May 28 1872, Nov. 4th 1879 Aug. 26th 1884, Sep. 9th 1884"
Sound right to you?