Summing up the comments
Here's what we essentially need.
High reputation users should probably keep an eye on the edit queue -and improve and accept rather than reject edits related to this fix up. If you're a lower rep user, feel free to edit, and link back here (and if you see anything that needs to be fixed up along with images, please do so).
If an image can't be found, and a reasonable best effort with the waybackmachine dosen't help, feel free to replace the image with a suitable replacement if its 'obvious', or remove it if the post can manage without it. If neither helps, leave it alone first (for now!) and we can work out what to do later.
I'd add its an excellent chance for people to work towards copy editor and steward badges.
I'm going to see if the other mods, and the community are on board with having an (extended?) period for cleanups like the tag cleanup weekend we had a little back. We should probably take the chance to handle the tag cleanup backlogs as well.