FrozenPlain has released Music Box Suite, a VST/AU instrument capable of producing both realistic music box sounds, and intriguing sound design. It has been released as 2 different versions. These build upon FrozenPlain's old Kontakt instruments Dual Music Box and Victorian Music Box.
The first is a concise free version which contains a single music box instrument. The second is a powerful instrument containing 2 music box instruments and a collection of complimentary sound design.