Yep there’s a whole industry around this too, you can watch these high end art auctions live where all the people in the room “bidding” are just representing the real bidders by proxy. It can get dark pretty quickly though if you start imagining what may actually be buying.
Considering the story of the Glomar Explorer, its astonishing just how much can the CIA hide in plain sight.
Compared to that, astroturfing the works of a few modern artists seems trivial (and does not require the CIA or any bogeyman organization, just someone with sufficient clout in the art critic world).
you can literally invent million dollar excuses for value transfers to arbitrary individuals.