Hellcarver Demon and Second Sunrise
That's correct, the cards in your hand were not "in play", which is the old name for the battlefield. The current official text of Second Sunrise follows the modern wording:


  Each player returns to the battlefield all artifact, creature, enchantment, and land cards in his or her graveyard that were put there from the battlefield this turn.


The cards from your hand were not put into the graveyard from the battlefield.