EDIT: "I can't see how the plates, if genuine, don't belong outside the Adams Trust."
"I can't see how the plates, if genuine, belong outside the Adams Trust."
If the plates are AA's work, they are his, and therefore, the Trusts. Finders' Keepers shouldn't apply.
If they are NOT AA's work, fine, Finder's Keepers.
If I recall correctly, a recently discovered Steichen Autochrome came into the hands of the Eastman House, yet the Steichen Trust controls how it might be exhibited. The is probably more to it than that, but there is at least THAT, and as such, the original may NOT be exhibited, but a copy may. While the Steichen provenance was impeccable, the similarity is clear. An unknown work comes to light through a third or fourth party, and the artists' Trust is still protected.
It seems the Finder is trying to act like the rightful owner in order to muddy question of ownership.