NEW : Well - known sign oversized enough for Ethan , who turns 6 Wednesday . Two bombs found in kidnapper 's bunker , FBI says . Local police : Ethan released from hospital . Law enforcement used a secret camera to spy inside bunker , source says .
NEW : Well-wishers sign oversized card for Ethan , who turns 6 Wednesday . Two bombs found in kidnapper 's bunker , FBI says . State police : Ethan released from hospital . Law enforcement used a secret camera to see inside bunker , source says .