I'm usually pretty good at putting things back where they're supposed to be, but I did something similar to your story with a Dead Can Dance CD. I even went so far as buying a replacement, even though I kept the old case. Finally, after several years, splitting up CDs with the ex, and moving halfway across the country, I finally found it hiding, doubled up in something else's case, while on a project to rip all of my CDs. And now I have two copies. Oh well!