Chapter 13, close to the end of the chapter (page 78 in hardback copy).

This section is talking about Vader building a new lightsaber.

"Sidious had provided the synthcrystal responsible for the crimson blade, along with his own lightsaber to serve as a model."

Obi-wan took Aniken's saber after their final fight, which should be the same one he gives to Luke in part 4 of the movies. In this world Aniken should not have his own saber to use as a model, because it was taken from him already...