In the movie The Thomas Crown Affair (1999), at the end we see that Mr Crown has actually returned the Monet:San Giorgio Maggiore at Dusk he stole from the gallery within a few days of the theft. The painting was hidden as a water color forging of one of Camille Pissaro's paintings, which he gave as a loan untill they found the Monet.
My Question: How was it possible that the gallery owners and the painting experts weren't able to see that it was a fake (given their knowledge and experience in such fields and the position they held in this plot)? Knowing most of Pissaro's paintings are based on oil.Source
Twelve oil paintings date from his stay in Upper Norwood and are listed and illustrated in the catalogue raisonné prepared jointly by his fifth child Ludovic-Rodolphe Pissarro and Lionello Venturi and published in 1939
For the sake of the plot my guess would be: They (the gallery owners) were so overjoyed that Mr Crown gave a painting to the gallery as a loan from his private collection, that they presumed checking it would demean the favor and might seem harsh too. Please do fill me in if I am missing something here.