Jim Fetzer, the main pusher of the erroneous  “nobody died” theory has proven that many of the alleged victims didn’t die in Vegas. So maybe those who didn’t get autopsied didn’t really die in Vegas, and the ones who did get autopsied did.
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https://www.youtube.com/watch?v=AMn0CAHoRT4

Clark County Coroner’s Office Fails to Autopsy Las Vegas Shooting Victims