luke shambrook , 11 , was found after he went missing on good friday .
the autistic boy was reunited with his rescuers in a melbourne hospital .
some members of his search and rescue team visited him on wednesday .
doctors are amazed at how well he is doing considering his four-day ordeal .
the boy was suffering from dehydration , hypothermia and exhaustion .
luke went missing in lake eildon national park - north-east of melbourne .