Collection Reflection

I've been weeding the fiction paperbacks in my collection. Part of this includes looking for missing items so that I can get a better picture of what is actually on the shelf and what might need to be replaced. Yesterday, I generated a list of missing books for the Science Fiction and Fantasy paperbacks (a collection with 1,000 items). There were 131 books on my list, which included Claims Returned items as well as those In Transit--you'd be surprised how many items have been in transit for years, at which point they're effectively gone from the collection--as well as In Process and Missing items. I found 30 of the missing books on the shelf where they were supposed to be, which was a relief because it means that I don't have to worry about reordering any of them, but also a cause for concern because there aren't that many books in the SF/F collection, and somehow the people pulling holds aren't finding them on the shelf. That left 101 books still missing. M...