A common deficiency in used iBooks is the lack of the leaf near the large colored Apple on the top case. You will hardly notice when it gets lost.

I had a good looking Blueberry iBook, which i preperred for my brother-in-law, and just this little blue leaf was missing. When i was cleaning up my daughter's room i found a plastic pearl in a beautiful shade of blue. The pearl was melted with a small burner and the liquid settled easily into the hole, where it solidified again.