That is actually my wireless mouse receiver in HS04. I know because I moved it around to identify each USB. HS01 and HS02 are my two USB 3.0 ports on the back, HS03 and HS04 are the two on the front. If I turn my Intel Wireless card back on in the BIOS it occupies HS07. I wish I could get on of those USB to 4pin 1.25 pitch cables to test my internal headers but I am located in Japan and shipping is like three times the cost of the cable.
I wonder if I could build one of these myself?
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I am reading up on USB mapping on the Dortania site.