wow sad that u guys struggle...
from earlier follow that guys walkthrough, the other wing is right below the computer desk, just click the eagle.
what to do with the pieces :
go the the very first screen that u started, right in from of the desk. see the presidential seal at the bottom on the carpet? click it. and if u can't figure it out from there u need help :P congrats, you couldn't finish the game without a walkthrough.. lol
great game, wish the ending conversation didn't go so fast. and dick cheney scared me too... lol