You may want to look closer into this matter Xsyon, our Tribe has been expeiriencing this as well. We are talking about more than any 10 people can haul off. Storage bins full of pouches, full stacks of fish and sorted metals. Enough that we went overweight multiple times collecting it to put it into storage and it is just gone.
At first we passed it off as you did, someone wondering through. But now there can be no doubt, we specifically put in more than any 10 people could hual off and most items where items you would not take more than a few of at most (like the pouches, stacks of dirt and granite)