Abstract: In a system for transporting bank notes between system terminals in a container for valuables, referred to as a cassette, each cassette is provided with an electronic unit or sealing provision. The electronic unit includes a counter (131) and a memory (13). The counter (131) registers a new count each time the cassette is opened. The cassettes can be connected both mechanically and electrically to any of the terminals. An electronic unit in a terminal includes a processor (20), a coding unit (21), a decoding unit (22) and a comparator (23). Before disconnecting a cassette from a terminal, the count of the counter (131) is read by the terminal and is encoded with the respective coding unit (21). The coded value corresponding to the count is then stored in the memory (13) of the cassette. At a second terminal the counter setting and its coded value stored in the memory (13) are read.