"a micro-B to female Type-A adapter is included"
Quick Start Guide and physical item supplied is not female, but male micro-b to male A USB.
What purpose does this lead have?
Can someone please check with nVidia and advise?
The lead may be for connecting to another PC?
Early Jetson TK1's were sold with both a micro-B USB cable (to flash the device) and a micro-B to female USB-A adapter cable (to have a second USB 2.0 port). The adapter cable was later removed from sold devices for a while (since someone at NVIDIA thought it wasn't too important), but I think future Jetson TK1's will be sold including the adapter cable (since I convinced people that it actually is important!). So some customers received that adapter cable for free while some customers didn't.