When I bought my Halo Triple Pack (box set containing Halo, Halo 2, and the Halo 2 Multiplayer Map Pack) it had the Platinum Hits version of Halo in the silver case. The other 2 titles were in standard green cases.
There is an opened Halo Triple Pack for sale at a shop down the street. The Halo in that set is the Game of the Year edition in the green case, not the Platinum Hits edition.
Any chance the first batch shipped this way, or did they all have the Platinum Hits version? I realize that someone could have put that in there and kept the PH version for themselves, but why in the world would anyone do that?