I received the faulty version of Caverns a week or two before Christmas I believe. Could have even been slightly earlier; I remember I was surprised. Unfortunately I gave it as a gift for Xmas (to someone excited now to buy the new books, so don't worry Mongoose!) and now am anxiously awaiting the arrival of the fixed version.
I'm in New York, by the way. I didn't buy the megadeal, but I've been preordering the books at least month or more in advance.