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Ouch. But first, ditto on the welcome!
Now then...
Are the dies steel (requiring lube) or carbide? Were the cases your son sized brass or nickel-plated?
If they are steel dies, and he sized nickel cases, it's almost sure that the dies are ruined. I've experienced those tiny nickel flakes in a die myself, and it is impossible to get them out.
Carbide dies are normally too hard to have anything actually imbedded in the carbide ring (which is only about an eighth-inch tall) so some delicate buffing might help. But chances are, you're still out a sizing die.
It is a lesson for your son to learn -- more so if he foots the bill for the new dies!
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