ok, unfortunetly i cant tell you the week of manufacture for my unit as for some reasom mine doesnt have that big white sticker on the box :s maybe it was on the bigger plain brown box i threw out, dunno.
anyway, here is a shot of my usb jack. as you can see near the top there appears to be two small metal lugs just behind the plastic. maybe they're using slightly different sockets at different factories.


incase you're curious this shot was taken with an n82 in macro mode with low iso and then cropped to size.