[CentOS] How does Linux Repair actually work

Thanks to the help of folks on this forum, I now have my Centos 4 box up and working, however I do have a question on how the repair actually worked.

After starting the Linux Repair, the process "found my installed Linux". Some of you will remember that I had accidentally erased the /boot and /boot/grub directories, but I had most of the files saved (not the symbolic links) and put them back into the directories *and* I did run a rpm reinstall.

When Linux Repair "found the installed Linux", did it create a new /boot and /boot/grub *or* did it just use what I had put there?

[I am now downloading Centos 5.5 which I'll install on a new drive and then face the challenges of moving my backup data to the new OS]

Todd