I'm like... in awe... I was browsing ebay when I saw a few music boxes and I found the company that makes them and went to check it out and found... like... 15 music boxes! Most of them play Music of the Night, three play Masquerade, One of the masquerade ones is indeed the one with the (butt ugly) monkey on it from the show, another is styled after right before Buquet falls hung in the middle of the ballet. The other is the Phantom all Red Death Style
My favorite one which got me looking for them in the first place was one of Meg and Christine (Scene would probably be "Angel of Music") and it plays Think of Me.
(I have proof for thinking Meg's gay and crushing on Christine... I do! Sorta)

I wish this one played All I Ask of You, that would be perfect, but it's another MotN.
Oh and linkage:
http://www.sfmusicbox.com/xq/asp/MGID.1643/qx/results.htm