Really wish this one had come out in perfect condition, (and it probably would have if I had left it alone in the pupal cell it constructed), but I'm still happy with the results. :)

The exoskeleton in many beetles darkens very quickly after molting, but it's still soft and easy to dent for at least another few days.

if you already knew at the beginning that you had a "Pasimachus" egg/pupa? Or was it a surprise package unwrapping before your eyes? How and where did you get the egg/pupa? Possibly I missed some answers in the comments attached to your several imaged stages. Addendum: I just now read that you discovered the egg/pupa in the same enclosure that also held a (live female) adult Pasimachus. So the likely assumption was that egg/pupa belonged to Pasimachus.

...as pets, with the goal of getting offspring from them. So I knew exactly what the egg and larva belonged to. :)