I'm getting this on a C6501, paper gets one - sometimes two or three even - wave near the trailing edge of the paper.
It happens from any tray, both face up and face down, and it happens about 80% of the time. Changing motors and clutches around made no difference whatsoever, neither cleaning the transport rollers. The few times I jammed the machine on purpose as the paper entered the fusing unit, the paper was never buckled, so I'm leaning towards the fusing unit, although I've never seen a machine do this before.
It happens with A4 paper 80gsm, as the pictures show (face up and face down, from either finisher tray).
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