Last Known Painting by Da Vinci sells for $450 Million

It'll probably be a combination of both, the painting was sold to an anonymous buyer so it likely wasn't sold to a museum. But many buyers of paintings like these will put the paintings on loan to museums, as long as the museums take care of the large upkeep costs of paintings this old, valuable, and fragile. So it likely won't matter that an individual bought it, it'll likely be in a museum anyway even if the museum doesn't own it.