[Tainari88]

Much of it isn't even on display.

The British Museum collection totals at least 8 million objects. Roughly 80,000 objects are on public display at the British Museum in Bloomsbury at any one time.

3,000 or so are loaned out to other institutions each year.

7,917,000 objects sit in a warehouse, not able to be viewed by anyone, gathering dust, and millions of these are stolen cultural relics from countries that very much want them back.

https://www.britishmuseum.org/sites/def ... ection.pdf

Professional thieves the British are.