Wasn't he restored from a V1?
The narration was unclear, but I think that it makes the most sense if we assume that Voldemort came up with the V2 Horcrux before he decided to use impossible hiding places, and that he was restored from a V2 Horcrux that was not particularly well-hidden.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 120.
Plans for next chapter release:
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)