I don't know if I'm going blind, crazy, or both.
I couldn't find my Limited B of Kobushi Sono Ichi. Not that I really needed it, since I had already imported it into my iTunes a few years ago, but the fact that I couldn't find the physical copy was driving me crazy. Since it was released after my 2015 trip to Japan, since it's not in oversized packaging, since I'd already listened to it, and since it doesn't contain a DVD or Blu-ray that still needed to be watched, it should have been in its proper alphabetical place in my stack of "to be filed" H!P, but I didn't see it there. So I looked everywhere else that it could possibly be (but shouldn't be). In the end, after about an hour, I looked through the "to be filed" stack again, and there it was: between Hello Pro Kenshuusei and LoVendoЯ, exactly where it was supposed to be.