Pretty sure the Silver/Tan one is a demonstrator making the rounds of the US dealers. These pics were taken of it by a member of FerrariChat when it was spotted at Symbolic Motorcars in La Jolla, CA back in early June. The Manufacturer plate is a telling sign:
The all white one was spotted in the Beverly Hills area too around the same time, so perhaps the same is true for both of them.
>8^)
ER