These are not different models per se, but prototypes in the sense that I had to experiment with the printer settings to get the parts to come out nicely. The tops of the prototypes are noticeably smoother than the final versions because I had to sand off support material, losing a lot of detail in the process. I’ve now found the settings that let me pick off the support material while leaving the print intact.
Each box is made of two halves that interlock through a ring of 12 scales that cross the boundary from the top to the bottom half, where they fit into recesses. These scales and the rest of the basic shape were modeled in SolidWorks, where I could accurately dimension them, while the rest of the scales were added through a custom brush in Blender to produce a more natural look. I glued four small rare earth magnets into the top and bottom of each egg so that the two halves hold together.