DayZ Experimental branch.
Having a base with a flag pole close to a gate with a lock on it, standing on the pole while unlocking makes the lock get placed on the ground under or inside the flag pole foundation.
It can't be picked up in any way while hovering the mouse over the item from any direction either in 3:rd or 1:st person view, and never shows up in the "Vicinity" list.
Added screenshot.