Gurajada's lost papers

In the introduction to "Girls for Sale", a translation of a part of the second edition of "Kanyasulkam' by Gurajada Apparao, Velcheru says that "Apparao's personal diaries, letters, other papers, all of which he wrote in English, have mysteriously disappeared, except for a few at the Andhra Pradesh State archives, Tarnaka, Hyderabad." I just came to know that many more are available from this year in the Archives with copies in Tirupati and Visakhapatnam.