This is the scene of the ledge on which the box spring rests. This wooden ledge is factory covered with a fabric like material which is pitch black.
Without decent light and more than a glance look this would remain hidden.
The white eggs look almost like glowing in the light. You can see the light reflected in the black extruded feces as well.
Point is even though this picture has great clarity, in normal circumstances, this is very easy to be misses by a casual observer.