Yes, I'd imagine that was the Brinks Mat robbery, which was 40 years ago, and selling the gold was only possible because the criminals undertook a pretty major operation (involving metal dealers, lawyers, several banks, estate agents, etc.) to melt the gold down, adulterate it to make it less pure, fake a ton of paperwork for where they got tons of new gold (including a fake mine in Sierra Leone), sell it, and then launder the resulting money through property and other assets. Pretty much none of that would be possible now, due to changes in regulations and legislation, not least because an actual major London bank went under as a result of their complicity and resulting investigations. Even then, it involved trusting dozens of people who were in on the conspiracy.Last year I saw a documentary on the largest gold heist in modern history. They claimed most of it will never be recovered because being an element, gold is notoriously impossible to trace. And lots of stolen gold circulates through official channels multiple times over.
A different version probably would be possible now, almost certainly (especially in London, kleptocrat theme park of the world), but it would still involve trusting lots of people (who are by definition untrustworthy criminals) with some version of your secret in order to launder your inexplicable gold and gems.


