Duplicates

Hello,

Lightroom stores original files on Disc C  - on my computer this is : C:\Users\Miroslaw\AppData\Local\Adobe\LightroomCC\Data\47fc3c74a31a45e18813f4434d5e85ed\originals.  In my case it was more than 300 GB, which occupied most of my 500 GB disc. I removed all those files, as I usually keep originals on a seperate disc. Problem: after the original files wre removed from my disc - I can no longer perform any operations on those files. Lightroom displays the removed files all right, but all editiong functions are inactive. Albums are displayed, files in the albums also - but editting is not possible. 

I  tried to romove one of the albums and re-make it again, adding the same files, but LT says that these files have already been added and refuses to add them again. During the romoval there was information that aolbum will be removed, but the files will be kept in a library.  Unfortunatelly - I CAN'T find where these libraries are - if I could - I would remove them, which, I think, would allow me to re-load the files again.  

Is there a solution to this problem? I found a suggestion on Adobe help desk to chhange tje name of the original file and re-load it to the album. OK,. this works all right - but  changing names of almost 15K files is impossible and  even so - it would result in an incredible mess. 

Can I do  anything about it?