I can't find the answer to this anywhere, and it's one of the very few items without a listing at the TSR Archive.

How many cards are supposed to be in Set One? The index has 396 cards, but the box I've got has a lot more than that in it, without any checklists to cover the extra cards. And the box can obviously fit way more than 400 cards (conveniently, about the number I've got, which is just about exactly double the 396).

All of the cards have the same green border, so they're not Set 2 (which is in blue). Is the packaging for the Deck just crappy, and forgets to mention you get about 800 encounters instead of 400?