Supplements
In the images below you can see how I created a tower of the pills to be dropped into the bounding box. I created three grids of points and then copied my pill geometry onto these points. I kept their scale uniform but gave them random rotations to make sure they didn't fall too uniformly into view. I made a small collision ramp to send them in the right direction and make sure they all fall exactly where I want them to.
Using the initial simulation for the outer structure of the pills I filled them with tiny spheres and ran a second simulation. They mostly stayed constrained within the main pill body but I found that some escaped. Now, I was able to fix this just by turning up the substeps in the second simulation, however I actually quite liked the look of some of them being in the background, so I decided to stick with the first iteration for the final render.
For the material colour on the pills and getting the C3 to “stick” I froze the sim on the final frame and transferred the colour attribute from a stand-in font onto the geometry, I then transferred the data from the frozen frame back onto the full animation. This meant that when the sim was run backwards from this point the pills that would ultimately end up within the C3 area, retained the colour. I did the same process for the separate tiny spheres.
As always, a tidy scene file, is a happy scene file!