I imported photos (2,500+) from 3 different cameras in Lr CC, put them in order and renamed them all (Nick and Liz's Wedding Photos-1, etc). I deleted the RAW files. When I recovered the RAW files from by backup hard drive, the file names were all were what the camera's named them (5D3-0001, etc). I thought I would just rename them all again but somehow I'm missing 2 files (I have no idea how or which ones) so if I renamed them, they wouldn't be the same as before and Lr wouldn't be able to find them.
Is there a way for Lr CC to find the correct original files? I already culled them all and edited around 150, I don't want to loose all of that!
LR knows your files only by path and file name.
Renaming files after importing them is not usually a good idea. If done any way, it should be done from inside LR.
In your case, since you did not backup the files after you renamed them, you are in trouble. LR does not know the original file names.
However, you might be able to manually match up the creation time stamps from the metadata in the catalog.
I was hoping there was something in the metadata that would be able to "re-link" the photos but it seems that isn't possible.