[CocoaKrispies]

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Dumbedore guesses that Vold will choose 7, because it is a magical number? But Vold is not aware that Harry himself is a horcrux, right?

So were there actually a total of 8?

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Yes, there were eight.

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I am pretty sure there were seven horcruxes. You see Voldemort was planning on making his last horcrux during harry's death, but he failed. However, he unknowingly made harry himself a horcrux.
Riddle Diary
Gaunt Ring
Slytherin Locket
Hugglepuff Cup
Ravenclaw Diadem
Harry Potter
Nagini

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Plus there was still a part of Voldy's Soul still in his own body, so it was split into 8.