No to all. I used to go to the iPhotos app (Show Package Contents) and find Masters and Originals. Now. in the Finder, under Users/Pictures/Photo Library (Show Package Contents) I see Masters and Originals, so I created a new Photo Library and imported the pics from those folders. Many showed up but there are many large gaps. Yet, on the System Library the thumbnails for all pictures are there, just that when I attempt to export a picture I get the cocoa error, and if I attempt a locate it, it also can't be found. If the thumbnail is there, then I would presume the photo resides somewhere. There seems to be no Show In Finder option.
Many of the photos/video are also duplicated some 12 times, all pointing to the same file. I don't know how to delete the duplicate thumbnails without inadvertently deleting the original.