I am looking at the numbering for Sahih Bukhari book 65 on this website
http://sunnah.com/bukhariI am not using the usc number
It says
Book 64 Military Expeditions 3949 to 4473
Book 65 Prophetic Commentary
Book 66 Virtues of the Quran 4978 to 5072
So it shows the large hadith number for all the books except Book 65
Also when I click on Book 65, it says Book 65, Hadith 4514
It doesn't give the In-Book Hadith number, for Book 65
For all other books within Sahih Bukhari it lists the big hadith number and the in-book hadith number.
Also, the number goes from 4514 to 5029.. but that doesn't correspond exactly with the books before and after it.
I am not using the usc number