Four hidden banshees on The Package
It seems that four banshees have been found by pressing two switches on "The Package". When you press both switches the "return to battlefield" message also disappears. You do need at least two people to get the banshees to spawn, as the second switch will disappear if not pressed within a few seconds of the first. It makes you wonder if there is something out there they want you to find.
Chevrolet Suburban history

Nice find. At least Bungie decided to make practical Easter eggs.