The UK justice system apparently didn't buy Wiese's explanation that the money came from diamond deals in South Africa in the 80s and 90s, and had been kept in a safetydepositbox in the Ritz hotel because of foreign exchange restrictions in his homeland.
He adds that another big benefits of this sort of collectible is that, unlike art or wine, which can be very expensive to store and insure, the notes and documents that he does not keep at home can be stored in archival folders in a common bank safetydepositbox and insured for pennies on the dollar.