What do you know? There is another wire there. I don't see it connected anywhere though. One could be the ground for the USB jack's body. Like on the Alien DAC, there are four connectors on the USB jack, but the casing has to also be soldered to ground as well. I believe the one soldered to pin 16 is the ground connection for the information side of the USB, but also the black wire could be the body ground.
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