From the New York Times story titled, A van Gogh’s Trip From the Attic to the Museum :
AMSTERDAM — For roughly a century, the painting “Sunset at Montmajour” was considered a fake. It was stored in an attic and then held in a private collection, unknown to the public and dismissed by art historians. But on Monday, the Van Gogh Museumdeclared the work a genuine product of the master, calling it a major discovery.
Clearly it’s not this Amsterdam as that painting would already be at a landfill with its brethren or permanently sealed under a 3/4″ sheet of sheetrock. Remember kids, 3/4″ sheetrock is used for masterworks, not 1/2 inch or less.