Dillier,
Are these QD's ball or poppet style? I presume from your post these are not connected to anything. All of them are metal to seal and with no pressure it is spring load holding them closed. With no pressure try gently pushing on the ball or poppet and then see if the leak stops. It may sound dumb but try operating the lever for that function to build a little pressure on them and see if they stop leaking then. The pressure will help them seat or if the seat is damaged will leak like a sieve and at that point you know they are bad.
Roy