I pulled this from the little silver cube it was printed on in the LAN area of the motherboard:
RU1-161A9WGF
No realtek sticker on it from what I can see... makes me wonder if it's counterfeit. DAMN OBAMA!
This leads to a LAN driver download on a google search, :). Bad news is all those websites looks like they'll give me the digital AIDS :(.
Nah, thats just the part number for the RJ45 socket.
This is somewhat similar to what you are looking for:

It'll be a silkscreen and not a sticker, although there might be a sticker covering the silkscreen, sometimes the silkscreen is sanded off when you want to hide what chips you are using. Most of the time when chips are counterfeit they are almost exact reproductions visually but often have obvious spelling mistakes.
I tried looking at the photos of the motherboard on gigabytes site to try and see if I could determine in what area it would be located but the picture didn't have enough resolution. It could be anywhere, but it should be out in the open and not hiding under any heatsink. It could be a smaller perfectly square package too.