Schools of gunmaking used similar patterns within the school, and at times shared patterns with other schools. Perhaps we are trying to read too much into these two sets of side leaves. While very similar, they are not identical in outline. The above rifle's box has a small emerging "leaf" above the top side leaf's rear piercing, and a similar small emerging "leaf" on the bottom side leaf in the detail between the two piercings. Screw heads appear to be different sizes, engraved lid borders apprear different, etc.
This same basic side leaf pattern was used in other schools as well (including in KY where I research), and is not restricted to Valley of VA. I think we can go into most well defined regional schools, certainly several in PA, and find strongly related side leaves by different makers who were not master/apprentice or master/journeyman. A good pattern at times got "shared" by others. Quite often, when patchboxes have similar shapes, it's best to study the engraving, borders, and other smaller details specific to a particular gunmaker, to determine who might have made the rifle.
I think at times in our desire to identify good quality unsigned rifles, we jump to the conclusion that "it must have been made by an apprentice of so-and-so," or "it had to be made in so-and-so's shop." These are mature rifles with good detail, built by accomplished gunmakers. I think if we do more comparative work with known guns by VA Valley gunmakers, makers can abe attributed based on the many other details of the guns. Shelby Gallien