He is fairly secret as to just what he has in his collection, at least there is not a list I can find on the internet. Out of the 47 the cars he is not selling is a second Carrera GT, the 918 Hypercar, the 959, and the first and last air cooled 911s.
He got one of his 911 RSR's backed into by a chick in a BMW while parked in the Hamptons a little while back. He seems a little upset and a comment about hearing the classic metal crunch. Most of the cars for sale are rare old cars, racers, and the Carrera GT prototype. Probably decided 47 is a little much.
The house in Colorado is big, maybe 18 cars is how many it's garage holds.