Here is the Deeley "box" ejector on a couple of early Jeffery sidelocks. Westley Richards sold these "boxes" to others under contract , demanding inspection at Westley Richards before the guns, finished up by others, were to sell.
I see that the second gun forend [lower] , a later one , is somewhat different from the first. It still may have the Deeley ejector, but I have not taken that forend apart. I think there was a change or two involving the Deeley ejector and those changes may show up in subsequent patents. The second and third pictures are of the upper forend.