My wallpaper is set to pull photos from I-Photo. Where are the mystery photos coming from?

I had three hundred photos (out of 4,581) that were in I-Photo. Then I moved them all to another account in the Mac.

None of the photos in question remain in my account.

But the desktop wallpaper (which I have instructed to pull from I-Photo) continues to display some of these photos.....but not all.

Where are they coming from? Even though I've moved them to a separate account, do some linger in the I-Photo Library?

A search in I-Photo shows zero. Ditto Spotlight search.