How can I identify them in document (since they are not listed in Links panel)?

What I can do in case I have like a 400 pages InD full of images, but only few of them are pasted from web browser.
(I can’t use Rik’s extraction from PDF since I need to keep all properly placed images in their original locations with their max quality)

Thank you for help.
I would sware this drag&drop images were in older version listed as embed.
Usually I do import properly, I just had a hard time with client so I wanted to make a quicker sketch.
Now I can’t recognise which ones are for replacement.