UPDATE with details...
My MacBook was used, so I didn't know the exact date of purchase. And, to complicate matters, I learned that the logic board was replaced (with a totally different serial). So, the serial number on the top case is about a year newer than the logic board.
He tried the serial off the logic board first, and it showed the date of purchase as July '07. By the math, I am outside the 4 year window. But, he said they would replace it no problem. He said the different serial number on the physical top case could have been a problem, but, since the logic board shows it covered, it was no big deal. (it may have helped that I was pleading my wife's furor over me getting a new MBP and her getting stuck with his one)....
I told the back story, as it seems that they have a great deal of latitude, either in the genius' judgment, or in the policy itself. I was certain the conflicting serial numbers was a deal killer.