The reason why timestamps have become important is we had a player join our Fellowship. At the time this was noticed by only one member in our Fellowship. She welcomed the player that had joined. When I come on to the game, I asked our member who she was talking about. She replied that she had already left. After that I checked our Trader, which I do regularly when I'm playing. All the trades that was in the trader that I had posted were gone. As the rest of the members logged on I tryed to check if anyone had used those trades. They said negative however they were noticing that the trades that they also had posted had disappeared. This corresponds to the time as far as I could determine as when that new player had joined our fellowship.