MBS supposedly purchased it….
https://www.npr.org/sections/thetwo-way/2017/12/07/569142929/mystery-solved-saudi-prince-is-buyer-of-450m-davinci-painting
Fits with "retired 2017" hat + bringing Dominos Pizza to the journos outside the other day.
I think either he did flip, or he's threatening to flip.
That was my first thought.