E.m.u: cd releases
Dear Friend, Bokutachi no Sedai Kara, Tsuitenai, Party all featured only in live concert form until the Memorial Box Set when they were studio recorded and added to the final result.
The Memorial Box Set also features a greeting message from the boys thanking the fans for their support etc (I'm still slightly creeped out by Hayashi Nobutoshi introducing himself as the "former" Hayashi Nobutoshi, now Kanna Nobutoshi").
Please remember however that Sotsugyou M music counts as separate from E.M.U music. One Sotsugyou-connected song appears on the Memorial Box because it was released as the group's final single - Oretachi no Sotsugyou. These are credited to the M Characters even on my DVD box set. And as for the rest of the Sotsugyou music...Sotsugyou M is not automatically E.M.U music (even though it's the same guys...sigh).
So...yep...the bulk of those songs are not on the Memorial Box set. See the Sotsugyou music page for more on this!