I had not seen any other coverage of this, but I've been busy lately. Here's an article, that covers how Chile got the nuclear materials in the first place:
"Like many countries, Chile acquired its uranium through a strategy aimed at preventing proliferation.
Over several decades under the so-called Atoms for Peace programme, states already in the nuclear club offered a deal to those eyeing membership: they would distribute highly enriched uranium provided it was used only for research and not weapons.
About 44,000lb of uranium was distributed to 50 countries from Jamaica to Vietnam."
I like this anti-proliferation effort better than that anti-proliferation effort, altho I respect them both in the context of their times. The prospect of dealing with all this stuff is daunting if not horrifying, but we _did_ start this particular game.
ETA: Additional coverage:
The site hosting this article is a big operation focused on nuclear security issues. Needless to say, it is Their Week in the Sun.