See the discussion around the supposedly lost Van Gogh painting, eg at https://news.artnet.com/art-world/van-gogh-lmi-group-2602847 https://news.artnet.com/art-

See the discussion around the supposedly lost Van Gogh painting, eg at https://news.artnet.com/art-world/van-gogh-lmi-group-2602847 https://news.artnet.com/art-world/van-gogh-lmi-group-2602847 Nothing about the painting itself would have changed, but its market value depends very much on whether Van Gogh painted it.