Shortly before my maternal grandfather died of prostate cancer, he gave my Uncle Bill, his eldest son and namesake, a box full of things whose inheritance he wanted to ensure while he still could. Its contents included, among other things, an official MLB baseball of uncertain context, a program from JFK’s 1961 inauguration, and most tantalizingly, a manila envelope that read, in Pop-Pop’s Sharpie scrawl, “Letters to Anita: Do Not Open Until After I’m Dead.”…