I'm having troubles...

I'm trying to get some photos back up in LR. Couldn't get them to come back up in the file where I thought they are suppose to be located. So I duplicated them in another hard drive and tried to pull them up that way. No luck. I hate to eliminate the ones I have in the catalog because I have already printed some of the photos and don't want to have to go thru and PP them again. Is there any way to get the photos back up with the same processing I did originally?
I get the box that says find the files, I say find them in the library, but when I click on develop, it cant find them.
please...suggestions.