I have no problem as long as such a gift stays in the family or dominated for public display to a public institution but no sales for profit.
Me neither. My son has a patch that was certified by NASA to have flown into space on a shuttle mission.
If they want it back, they won’t need to go far. He works there.
You cannot dictate what some does with their property.
What I know is that all Americans paid billions to send man to the moon, and these astronauts were honored to be chosen. But they volunteered to go and what they returned with doesn’t belong to them. It belongs to all of us.