Basically, my friend and I spent days playing on only one server. As we looted our corner of the map, we branched out more and began to find fewer and fewer items. The military bases, firehouses, police stations, and many other locations had been stripped bare. Eventually, I stumbled across a barn in Sinistok that has hundreds of items in it. There are two barns north of Sinistok right next to each other. It is the one further north.
http://www.izurvive.com/#c=71;-150;7
I filled my backpack with items to max capacity and dumped them outside the barn, over and over, for at least an hour and a half. The cleanup system gradually cleared away all of the items I moved except for lime, flareguns, and teddy bears. I moved at least a couple of hundred items and there are still at least as many items still in the barn.
The most disturbing part is that the game is continuing to add more items to the barn. On the uppermost level of the loot, there were no military vests when I left it yesterday. Today, there were two more spawned in there. I am dumping items outside of the barn in an effort to get the loot redistributed back around the map. {F31635} {F31636} {F31637} {F31638}