I'm going to put out that both the mirror and and the insignia have been dealing psychic damage. Which means there's a high possibility that whatever is behind the door couldcause panity damage through psychic attacks like the two items needed to open it up. I was immune to it since I'm dark type, so its possible being a type Psychic is weak against (IE Steel) might take less damage. Food for thought, though I wouldn't place all my bets on it. At this point I'd just send someone with Full sanity (And security if available) to tackle it and hope for the best.

Also, I can go and repair the elevator since I have the repair skill.