through the webUI, add new images and select the type, name, and storage location to match what they were. Doing this tells the FOG database about the images, but doesn’t actually touch the contents of /images/ on the FOG server.
You need to make sure the type and location match the files in /images/ though or you’ll have problems.
I suggest in the future you use VirtualBox as a test bed so you can avoid similar issues in the future with your production systems.