Sorry to hear this has happened to you. Always one of my fears seeing a new SP and not knowing if she is gonna go through my bag or pants when I'm not around.
I think it's unfortunate that you really don't know who did it. I do have a lot of respect for not divulging the three SP's no matter the amount of pressure.
Talk about tarring all three with the same brush! Honesty and integrity are recognized as attributes for everyone in this industry. That can disappear in a micro-second if attached to a theft they had nothing to do with at all. The two others would suffer the same blame even though innocent.