There's no possible way that this could be implemented. Think about it, there are almost 100,000 congregations worldwide. The society would have to think of 100,000 ways to say the same thing in their letters to the bodies of elders worldwide in order to have each letter be distinct. How many man hours would that require? And they would have to do the same thing for every single letter that gets sent out.
Even if the society decided to follow through with this, how would you determine which elder leaked the information? Couldn't the elders simply deny having done it or claim that the letter was stolen from the congregation archives. The foul odor coming from that rumor is suffocating. I wouldn't pay any attention to it.