You can just walk into the Co-Op (East one just by the Law School) and buy your books. There may be a few that are still missing, but when they come in you should be able to just walk in and get them.
The 1L books were not along the wall where they have the big sign for law school books. They were out on pallets right next to it in the aisles. When you get there, they have signs hanging from the ceiling for each section above that section's pallet of books.