The exhibits were stolen According to British media reports…

[Stolen exhibits] Police are investigating the theft of an 18K gold toilet on display at the former British Prime Minister Churchill’s Blenheim Palace in the early morning of September 14, according to British media reports.
The gold toilet made of 18K gold was produced by Italian conceptual artist Maurizio Cattelan and exhibited at the Guggenheim Museum in New York on August 30, 2017. The gold toilet was named "America". The author hopes to use this pure gold toilet to express a sharp irony about excessive wealth. "Whatever you eat, a $200 lunch or a $2 hot dog, the results are the same. The exhibit can be used as a toilet, and the museum security is next to the toilet door. Before the theft, visitors to the exhibition can make an appointment for three minutes to use the toilet.
The exhibit was previously exhibited at the Guggenheim Museum in New York. It is worth about 1 million pounds ($1.25 million).
Police said that because the toilet had been connected to the palace pipeline system, the removal of the toilet also caused serious damage to the building. The building is listed as a World Heritage Site by UNESCO. It is filled with precious works of art and furniture.