So, you’ve tidied up your bin / gdi files but after finding all of your CHD’s launchbox doesn’t actually add them to the platform / emulator!
Instead of choosing Tools >> “Scan for added ROMS for your platform” or Tools >> “Scan for added ROMS for All Platforms”
Go To >> Tools >> Import >> ROM Files
Choose your image and video options and then select the folder containing your CHD’s or manually choose the CHD files themselves. Finally, choose the Platform you are importing the games to and the emulator that will play used to launch them.
Launchbox will now import the games correctly and download any relevant artwork etc.