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I have a nomination for the most concentrated private cash stockpile: a Russian police colonel kept 131 Million USD in an apartment.[1] [1]https://www.bloomberg.com/news/articles/2016-09-14/russians-...

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I used to work a night shift in a cash depot that routinely stored over £200m. It was famously the subject of a heist, and the robbers only quit at £30m because they couldn't fit any more in. That was a lot of money.