check either the fuse or relay for the indicators. but also as BIGLEE said if the hazard swithch has become detached, even partially they wont work, had exactly the same as him.
the red key is one of those areas that if you dont ave it and you need it you could be up the creek, if you have it you may never need it. as said though, if it was from a garage then go and take it back and insist on them finding it, if not hope you have no need for it, you may never but you never know