Miss Information is among the missing
Sometimes the library can't find things. It may be because the thing is misfiled, in use or has been stolen. In any event when something is missing for whatever reason, there's a message on the catalogue record that says something like "this thing is missing--we've looked all over but so far no luck".
Today a man came to the information desk looking for a book. It was about improving your brain. Miss Information was pretty impressed with his brain. He'd actually managed to look up the book in the catalogue and take note of its location. This is better than 75% of the library users could do. Go ahead, laugh. The book was missing. He'd noticed the missing status on the catalogue record. Miss Information was about to give him a MENSA application form but he continued to speak. The man said that all he needed to know was where the library kept the missing books. Um, what? Well, you know, where is the box (or shelf) where the missing items are located?
Miss Information explained the whole "missing means we can't find it" concept and suggested other brain improvement books. This guy just needs a little more help....