On my server (6441) there were several clans last, including my own, that had everything in inventory slots wiped out of a location except for assigned bench thralls. Even the locked chests are empty. I walked into my base and even the beehives were completely empty. There is nothing in the event logs, like it usually shows when undermeshers sneak into a base. All the clans are reporting the same things - empty inventory, bench thralls remaining, locked chests empty.