GOT MY RG620!!! KILLA!
I doubt you got a fake. The previous owner may have had the switch replaced, or the factory may have installed it. Ibanez lags behind in updating the paper work that comes with guitars. The first run may have had 3-way switches and the manuals were printed for that. Later down the road, the switches could have changed without the paper work being updated.
No big deal, really, the 5-way will give you better pickup options than the 3-way.
"....shut up and play 'yer guitar...." :thumbsup: