The First Scenario:The whole thing here.
The corrupted official can sell a fake painting at any rigged gallery. After coordinating with the official, the briber will go to the designated gallery and buy it at the agreed price plus the commission of the gallery owner. All of the three parties know that the painting is fake, but eventually they are all benefited. This fake painting can be reused and it can go through another bribery circulation of other “elegant” buyers and sellers.