Some of the works of art owned by former queen Juliana are not yet on show to the public, even though this was part of the agreement made between the state and her three daughters to settle her estate, according to television current affairs show Zembla.

The royal family paid a large part of the inheritance tax on Juliana’s estate in the form of paintings, furniture and other works of art with a combined value of €7.3m. At the time this was done on the condition that the works went on public display.

According to Zembla, however, at least two prominent items remain in the royal palaces, out of sight to the public.

One, a pen and ink drawing by Willem van de Velde (1633-1707) is said to be worth €2.5m and still hangs in king Willem-Alexander’s private office.

The other is a collection of five pieces of malachite furniture, worth a combined €500,000, which is kept away from the public gaze in the king’s The Hague headquarters, Paleis Noordeinde.

‘We did not intend for the furniture to remain hidden in a palace,’ art historian Rudi Ekkart told the programme. He was one of the team involved in dealing with Juliana’s legacy.

The state information service RVD said the articles had been acquired by the state for use in the royal palaces and that there is no issue with where they are currently displayed.