Item Despawn

Drops that are loose in the world (i.e. not in your inventory or a storage unit) upon logout of the save file will despawn, or disappear. At that point, it is impossible to reacquire them. It is also rumored that item despawn will occur if a maximum number of drops is reached on-screen or perhaps throughout the world. In this instance, the items that have remained loose for the longest amount of time may vanish as new items are added to the screen. However, this theory has not yet been tested officially.