If they are wild caught in your area and eating their natural food, and you are releasing them, I would not mark as captive. On this site, Captive observations are pretty much ignored. If you are documenting life stages of a caterpillar that is not well documented, who is going to see it as casual? Your house isn’t a zoo. They are getting minimal human care.
You could post the later indoor photos on the original wild observation. That isn’t following iNat rules either, but this site isn’t built for life cycle observations.