FWIW the Kansas Cosmosphere supposedly has the most extensive Soviet space collection outside of Russia. So if you are driving across on I-70, it’s definitely worth a diversion.
The rumor is the stuff was on tour in the USA in the 90’s with some scientists, during which the Soviet Union fell apart, and they sold all of it.
I don't know if there was only one tour or multiples, but I do remember going to see the display in Little Rock. This was 1995 or 1996.
The display was interesting. There was the hardware mixed with some very fanciful paintings of cosmonauts by a Russian artist. The paintings were in a flat style, almost like Orthodox icons, and featured several scenes of cosmonauts with halos descending from heaven like angels into villages where the peasants were awestruck.
If this description reminds anyone of the artist, please let me know. These paintings have haunted my memories for the past 20+ years but I cannot find the artist. Even asked in groups and subreddits specializing in imaginary astronaut / cosmonaut art but no one's ever seen it nor knows the artist.
If you're in southern California, the slightly surreal Museum of Jurassic Technology in Culver City has an exhibit called The "Lives of Perfect Creatures: Dogs of the Soviet Space Program" (a reference to a Tsiolkovsky quote)
The rumor is the stuff was on tour in the USA in the 90’s with some scientists, during which the Soviet Union fell apart, and they sold all of it.