A fraud detection system for a reverse vending machine, the system including: a detector adapted to detect at least one container entered into the reverse vending machine; a compactor load sensor adapted to measure load of a compactor of the reverse vending machine during operation, wherein the compactor is adapted to compact entered containers downstream of the detector; and a compactor load sensor monitoring device configured to determine whether the detected at least one container is compacted as expected based on the load measured by the compactor load sensor.
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