I have doubts Congress is going to cater to the specific needs of one eccentric film director.

In the 1920's, the Bram Stoker estate won the right in court to have every single copy of Nosferatu destroyed, yet it has survived to this day.

Lucas can't get his mitts on every print of the OT any more than he can make all those copies of the Holiday Special go away. He sure as hell can't touch the complete Super 8 prints that were legally made and sold.

Most 35mm film collectors do not advertise what they have to begin with. It's a very secretive closed circle that isn't open to outsiders.