I mean - the british museum did sell a bunch of these off to private collectors under the direction of an incompetent director in the 70's... so maybe where they are doesn't make them immune to corruption.
I'm wondering what happened to the ones the director sold to his brother for "altruistic" reasons.
I'd be more concerned about those items going to private collectors, since they're probably safe for a generation and then likely to be scalped by the heirs for cash.