In my story they were at Corpus at Oxford because silly me, I WAS UNAWARE CAMBRIDGE HAD ONE TOO! Also, I think if they suddenly showed up in Massachusetts while Sam and Dean bitch at each other it would be really strange.

Dean: WHY DOES THAT SCARY BRITISH HOOKER WHO KEEPS GOING ON ABOUT FU-CALT LOOK LIKE ME?
Sam: *too busy talking political philosophy with scary British hooker two, better known as Jared*