Nietzsche, Stirner, Dostoyevsky

Charles Pigden, a philosopher at the University of Otago, writes with questions, which I invite readers to address:

What is the scholarly state of play with respect to Stirner's influence on
Nietzsche? There are obvious though perhaps superficial affinities which suggest such an influence and it seems odd to suppose that a voracious reader like Nietzsche would not have known about Stirner and would have passed him by if he had known about him. But as an argument this strikes me as a touch too much like those speculative biographies which enlarge at length on what Shakespeare 'must' have felt or thought. I understand from Safranski's biography that Nietzsche never mentions Mad Max in his extant works or correspondence but that there is evidence from the
memoirs' of Ida Overbeck that Nietzsche not only read Stirner but admired him. Safranski takes the case for influence to be proven, and embarks on a summary of Stirner views in order to clarify what he takes that influence to have been. But is he perhaps being premature? Could Frau Overbeck have been confabulating to back up a thesis she believed for other reasons? Has anything been discovered since Safranski's book which sheds any light on the issue? And what do you think? I note that the issue is left to one side in Nietzsche on Morality and that nobody so much as
mentions Stirner in your OUP anthology (which surprised me a little).

A related question: Do we know which of Dostoevsky's books Nietzsche read apart from Notes from the Underground (which is mentioned in a letter in Kaufman's The Portable Nietzsche)? The question is relevant since I am inclined to think that Dostoevsky's character Stavrogin, the hero of The Devils/Demons/the Possessed is meant to be a sort of immanent critique of Stirner's ideals. Was The Devils translated into a language that Nietzsche understood during his sane and productive lifetime?