Fake but accurate?...................
Hey, if someone’s good enough as an artist to paint forgeries that confuse the experts, why not buy them at a forger’s discount & enjoy?
I read a book on art thefts a year or two ago.
Granted, buildings that didn't exist prior to the artist's death is somewhat definitive of fraud.
However, in the early part of the 20th century, a fraudster would have multiple copies of a famous work made, bribe a museum guard on the night shift, place a copy behind the original, bring in his buyer, have the buyer "mark" the back of the "framed" art, repeat for all the buyers, and deliver the goods.
Sometimes, the con would also steal the original for publicity before being able to collect from each "copy" buyer to give the illusion of a copy being real.