[Leica] Just what does EX on *bay mean anyway?

[vick.ko at sympatico.ca (Vick Ko)]

I just received a lens from a reputable store that held a recent auction on
the *bay.
 
The lens was described as "EX" with a "slight mark" on the lens.
 
I just re-read the description of the "slight mark" on the lens. 

The slight mark is a surface gouge that is over 1/8 inch long  and is 1/2
inches from the rim - i.e. not close to the edge. 
 
And there are additional defects on the lens, particularly that the lens
surfaces are full of cleaning marks and there is something loose inside the
lens.  In fact, it sounds like a lens element is loose.
 
So is that "EX" to you?

The auction states "no return".  

Is there any recourse?  
 
..Vick