Are they actually in Unattached Items or are they just unattached (slightly different) ...

I have no idea. All I remember is...

- Back in the old days of the car player, if something wasn't in a playlist, it was an unattached item, and that was a bad thing.

- When they added soup views to the car player and to the central, it became OK for there to be a song that wasn't in a playlist. So they hid the Unattached items and aren't displaying any errors about it any more.

I could be remembering all of that wrong, hence the reason I'm not understanding what you mean by there being a slight difference between Unattached and unattached.