Nabokov must have had a reason to hold on to those two index cards and not burn them, as he had burned handwritten pages of the manuscript. He had been compelled to write notes on both cases, and in particular the death of Sally Horner. He included the parenthetical reference in the novel when he could have left out any mention altogether. Sally’s story mattered to Nabokov because Lolita would not have been finished if he hadn’t read of Sally’s kidnapping.
