Nico’s belief that all Michael’s letters will have been destroyed - although it was months before we had Peter’s word for it, in a letter to Mary Hodgson (June 11 1953, in the database).
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There's very little of Michael. You see, he hadn't started on Michael. Where Michael's letters are....they would've all been destroyed. When Michael went off to Eton, he and Uncle Jim wrote to each other every day. And Michael was unhappy and more or less cried for two years.