and my 38-ton Richard Serra sculpture?

BBC reports:  A leading Spanish museum has admitted it has lost a massive steel sculpture which weighs 38 tonnes.

Madrid's Reina Sofia Museum bought the Richard Serra sculpture in the 1980s for more than $200,000 (£114,000). The museum says that in 1990 it put the sculpture in a warehouse belonging to a company that specialises in storing large-scale artwork. The piece's disappearance only came to light when the museum's director Ana Martinez de Aguilar decided to put it on display again.

Source
BBC. Madrid 'mislays' Serra sculpture
The Guardian. Museum discovers loss of 38-tonne sculpture