Junta de Calificación (Board of Classification, Valuation and Export of Historical Heritage Assets). Giving in lieu of tax liabilities has declined since the economic downturn in 2008 left the Spanish government (and many others) more in need of liquidity than art objects.
There is only very limited space for display at the museum so most pieces will sadly have to join their 60000 odd brothers and sisters in the museum's different warehouses and at other museums.
Amongst the more recent items are furniture and fittings from the from the iconic Torres Blancas (white towers) apartment building seen by visitors arriving in Madrid by car from the airport. These are classic seventies design that must seem like antiques to young people today, but can serve as an inspiration to contemporary designers. There's also a prototype plastic mop-wringer bucket from the 1950s, now a design classic.