Not a single Bothan died to get us this blueprint of the Millennium Falcon. Take that Leia. Also, please note that Han lied. Those hidden smuggler compartments? They are totally on the blueprints. OK, sorry, back to the car geekery.
These are fake. In the Corner you see modification requests signed off by HS...but if you recall, Han Solo didn't request modifications to the Falcon, he won it from Lando Calrissian "fair and square" after it had been built. Something tells me that Lando didn't "buy" it either. Just sayin'.