I wrote this script to find these 'photos' and to move them to the trash.
tell application "iPhoto"
set curPhotos to selection
if (count of curPhotos) ≤ 0 then
display alert "You need to select the photos you want me to process."
set countPhotos to count of items in curPhotos
repeat with i from 1 to countPhotos
set thisPhoto to item i of curPhotos
set t to info for (image path of thisPhoto as POSIX file)
on error eStr number eNum partial result rList from badObj to expectedType
Open Script Editor, cut and paste the above script into the editor, Compile it to check for errors, and save it to a file - perhaps on your desktop but anywhere is fine.
To run it, open iPhoto, select the Photos Library, Select all photos you want to process (Edit - Select All is what I usually do), and then switch back to the Script Editor and press Run.
When it finishes you may have some missing photos in your trash. You can decide what to do with them at this point - I just empty the trash.
If you use it, write a short comment about whether it was helpful or not or whether it worked or not. If you improve the script, let me know as well.