Unique Identifier from Log or MAVLink

Is there a method over USB or in an ArduPilot log to uniquely identify a cube? It doesn’t necessarily have to correlate with the HX4 serial number (althought it would be really cool if it did), but it would be great if it did!

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In the log there is a MSG showing UID of the Cube. This is also shown in the message window in GCS after the Cube is booted and connected.