Here is a pair of Koss MV-1 studio headphones for sale. I have got it as a replacement from the official Koss UK distributor, it has never been used just tested, still in original packaging, all accessories are included.
Right out of the box, in one of the cans there is a small bit of something which makes a slight rattling sound when it is shaken, but it cannot be heard when using, doesn't affect the listening experience at all. Haven't been burned in yet.
Edited by hallom - 4/1/13 at 4:24pm