Thanks. That's kind of what I assumed but I don't recall seeing it even suggested in the rules.
The closest we have is...
Page 11 of the Rules of Play
Drawing Mythos and Trauma Cards
A number of Keeper Action cards allow the keeper to draw more
Mythos and Trauma cards.
Page 16 of the Rules of Play
The keeper takes all cards that have one of these icons and
shuffles them together to form his Mythos deck. He returns
all other Mythos cards to the game box.
After playing a Mythos card, the keeper discards it to a faceup pile
adjacent to the Mythos deck. If the Mythos deck runs out of cards, this
discard pile is shuffled to create a new Mythos deck.
This states that the Mythos cards are shuffled and there would be little point in doing this unless the draw was blind.
Page 25 of the Rules of Play
Trauma cards are kept in the keeper’s hand until played and are
drawn using specific Keeper Action cards
• Decks of Cards: If a deck of cards runs out, the players
shuffle the discard pile to create a new deck.
I think this all implies you do draw Trauma and Mythos cards blind.