Glud & Marstrand (G&M) recently filed for legal action against Microsoft. The Danish company alleges that Microsoft violated a nondisclosure agreement by revealing their metal game case technology to a rival firm. The Halo 2 special-edition packaging was made using this design. G&M alleges that they approached Microsoft in 2002, when the companies signed NDAs and proceeded to share information. In 2003, Microsoft contacted G&M for a potential deal making metal cases for Halo 2.
News source: GameDAILY