This would be pretty hard to track down. I know that PMs are working, I get them every day.
My guess is either, the person either didn't really send a PM and lied. They thought they sent a PM but something happened and the page never loaded or something.
Also your infraction in December was reversed on the same day. The only thing I can think of is that since it was reversed, the PM was deleted. However I'm not positive on that.
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