a cassette which is arranged to hold currency notes or other valuable articles and which may be used for transporting currency notes from a bank to an automatic cash dispensing machine . the cassette includes a receptacle for notes , and locking mechanism for locking and unlocking the receptacle . there is provided a tampering indicating mechanism which is arranged to be actuated during an unlocking and locking cycle of operation of the locking mechanism , this indicating mechanism including a latch which is set to a first state when the cassette is loaded with notes . the latch is tripped during an unlocking operation of the locking mechanism , the latch when tripped serving to prevent any further unlocking operation until such time as the latch is reset to its first state .