[userbinator]

As a counter-anecdote, in my experience it is very uncommon for large entities which are disposing of books and other equipment to remove such labels even from things they clearly intend to not keep. You identified something which was likely a mistake, but I've had the opposite reaction when I asked about a "do not remove from this room" label on a book I wanted to buy: "oh, that's just left over from when it was a part of our collection, but we are selling it." (In the end, I bought it.)