The original Guardian article says the set designer that bought it for the film in 1998 had it hung on her wall for years before selling it to a private collector. In 2014, the private collector, after having learned about the painting’s significance, sold the painting at an auction for €229,500.

This is kind of a tall tale, It was bought by an art collector in the 1990s. It was sold to an antiques store in the 1990s. The painting, when not being used for money laundering or without publicity, was auctioned or sold at $40-$400-$500, even with proper attribution before.