I had a patron come in today asking for books written by Machiavelli. Did more than a handful of searches, and only 3 books came up. Two were already 'lost' (aka a patron still has them). One said it was on the shelf.
So I wrote down the call number (320.1 Machiavelli for those interested) and sent the patron on his way. A few minutes later, he comes back. Not on the shelf.
So I go back there and look at not only the shelf it's supposed to be on, but on surrounding shelves.
Not on the shelf.
So I offer to order the book, but he laughs, thanks me but declines.
So I order the book for our collection. And I gratefully note that I'm glad that I'm weeding the 300s so I can hopefully find it.