From time to time a sweep of the city occurs. Loose prims cause lag and clutter. Help out to keep the city functioning at its peak. The biggest culprit seems to be when you change an outfit. It is easy to select DROP instead of DETACH when creating or changing outfits or switching HUDs. Be on the lookout for these misplaced items. If an item is found it will be returned, look in your Lost and Found folder to reclaim the item. Current count is 16,857 out of 20,000.