2433. From Here

"Midnight, was that the last group?" Walker saw that Midnight had just returned again. This time she was leading a group who had significantly less to carry and transport back to the camps that had been built for evaluating items. 

Her nod made Walker understand that the storage areas in the slumbering hall had been handled and that everything there was handled for the most part. Meaning, that he could stay focused on the books and learn how to restore them. 

Midnight came over and was watching from behind him as he followed some of the newer skills he had just learned. 

"I was working with a few of the archivists and the restorers to figure out what I could do to help. But look at all this." His hands gestured to three books that he had worked on compared to twenty that another had worked on.