[COMMUNICATED]
Reb Chaim shlit”a relates to his student, Reb Uri Tigger shlit”a, that someone had mentioned to Reb Chaim that he has the sefer Rabbeinu Yeruchem that belonged to the Bais Yosef. The Bais Yosef wrote an index for himself of all the places that the Rabbeinu Yeruchem is mentioned in his very own sefer, the Bais Yosef.