Chaplin Fighter Museum at Falcon Field (Mesa, AZ), when sold off went to a lot of private collectors and the rare museum. I feel fortunate to have been able to tour it many times with family when it was still in operation. Used to be, you could fly in to Falcon Field, park on the ramp for free and they'd let you in for a greatly reduced price (*free, from time to time if they weren't busy). What a great collection that was.
Would make a cool road trip to see his one,