Lost Previews, Masters remain, Rebuild isn't helping

In attempt to repair a Dropbox issue, I pulled out the Preview and Thumbnail folders to my desktop and then rebuilt iPhoto.
Most of my photos are still visible in iPhoto but there are a lot that are missing. I only see the outline of the image that should be there. I can go to File > Show in Finder > Original / Modified and the image is shown in Finder.
If I drag the previous Preview and Thumbnail folders back in to iPhoto (via show package contents) then all my images return again. The difference is over 2GB though so I'd like to have it rebuilt and consolidated as much as possible.
Any ideas?

Think of it this way:
I open the bonnet of my car. I yank out a few pieces. My car won't start.
So I put the pieces back. The car starts.
That suggests that the pieces are important to the working of the car, no?
Similarly with the iPhoto Library: Don't change anything in the iPhoto Library Folder via the Finder or any other application. iPhoto depends on the structure as well as the contents of this folder. Moving things, renaming things or otherwise making changes will prevent iPhoto from working and could even cause you to damage or lose your photos.
What exactly are you trying to achieve?
Regards
TD

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