Used ASUS ROG Crosshair VIII Hero WiFi motherboard.
Adult owned, never overclocked.
Comes with the retail box and nearly all the included accessories, save from maybe a few SATA cables. Tossed in shorter antennas for the WiFi and Bluetooth! There's plastic wrap over the thermal pads for the M.2 drive heatsinks, too.
It works great! I've just upgraded to a new system with an AMD 9800X3D.
Also, take a look at my listing for 64GB of Corsair Vengeance DDR4 RAM, too!