I tried running a syscheck but that only shows IOS....
CIOS are simply IOS that have been modified (custom IOS = cIOS). CIOS are always the IOS in the 200+ range.
A basic introduction to Wii hacking | Brick Prevention- Things you should never do
Guide: Virtual Wii (Wii Mode) Softmod for Wii U | Guide: Softmod ANY Wii | d2x cIOS Installation Guide | How to Run & Post a System Check