Looks like I just received the item that one of the buyers returned complaining on box and windows that had been already activated.  (1) But my problem is that one of the corner of its chassis was crushed near 3 expansion slots.  The side door doesn't even open with the lever at all.  The crushed chassis seems to be the cause and it will definitely be problematic for any future use of those 3 expansion slots. Quite disappointed. (2) I checked the Device Manager and found no USB3.0.  I guess I need to return this item.