I bought these new from Sweetwater in January 2018. I have used them in rotation with several other headphones that I have cycled through.
They are in excellent condition and come with all of the Sennheiser boxes and documentation. Also a copy of the purchase invoice. They come with the Sennheiser stock cable that is terminated in 1/4" and a custom cable that is 3 ' long and terminated in 1/8" inch. They do not come with a balanced cable.