“Some of those artifacts should still be displayed and properly labeled as copies. It’s still okay.”
Are they copies, or are they forgeries?
Not sure. They may have been sold as forgeries.
It’s a chance you take from any dealer of antiquities.
This often happens to other kinds of museums.
The Curator may not catch the latest techniques of fakery.
But now that it’s proven that they are not originals, use them anyway, just openly acknowledge these are copies or prototypes. No need to weed out and close down some of the more interesting themes of display. I would very much like to visit such a museum myself. The San Fran Bay Area is ‘not known’ to have many such places. They have the opposite types, though.