ok so a 20' shipping container full of loose natural uranium is probably a bad idea, but exactly how bad of an idea is it?
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Uranium metal rather than ore? Pelletized or something?
Not a whole lot. Lumps of non-enriched uranium are basically meh, but if you bang it around enough the powder should not be breathed and may spontaneously catch fire as metal powders often do.
And the oxide offers opportunities for heavy metal poisoning, so don't lick it. And don't drop it on you, it's heavy.
Radioactivity-wise, basically a nothingburger. I'd sleep on it.
