Well, editing in the Lightroom don't impact the Original images at all because when you import the images in Lightroom it only imports the previews of the images and whatever editing to perform that all happen on the previews only.
If you still see the previews in the Lightroom, means its not deleted through the Lightroom.
You need to check the Original location where you have saved the images, if in case you are unable to find it please right click on the folder under Library and click on show in explore.
Let us know if that helps.
Mohit, thank you for the answer.
The problem is that the original RAW files disappeared from the original folder, and of course L doesn't "see" and cannot work with them.
Well, then you need find them and Lightroom won't be able to help on this.
Please check the trash bin, connected hard drive Or check if you have moved it some other place.