I was going through a number of publications I have while searching for some materials for my weekly newspaper articles and I found an old copy of the Annual Report of the Brunei Currency Board. The Brunei Currency Board (now renamed as the Brunei Currency and Monetary Board) is responsible for issuing all the currency notes in Brunei Darussalam.
This 1986 report had this photograph of how used and tattered Brunei money was taken out of circulation by being burnt. It was a real live furnance which was used. I am not sure whether this practise is still being maintained or whether they use a shredder nowadays. I have to ask my colleagues.