Odd (Redux)

So a patron comes in with a stack of books about Virginia Woolf. I check them all out save for the last one, which doesn't have a barcode -- not an odd thing in and of itself here at Widener, where there may be tens if not hundreds of thousands of volumes in our collection yet to be barcoded. But when I go to manually process the item, I notice that not only does it lack a barcode, but it is also missing a due date slip, a call number, as well as a bookplate, embossed stamp, or any other marking denoting that this book is the property of the Widener Library.

I ask the patron if it's her book, as that sort of thing happens all the time; she says no, she found it on the shelf with the others!

Now quite confused, I look up the book by title in the catalog and find that while we do in fact own a volume similar to the one I'm holding in my hand (two copies of it at that), the item in question should not have been located where the patron found it -- amidst a run of books by and about Woolf cataloged according to the Library of Congress system of call numbers -- but in an older section that used one of our in-house classification systems.

So in other words, not only is this not our book, but an item that someone decided to bring in of his or her own accord and shelve (incorrectly, as it turned out) as if it were part of our library's collection. Presumably this was done out of the goodness of that person's heart, although when you're dealing with folks who are just randomly adding items to the stacks you never really know...