Rears are definitely toast. Those tire sizes are also narrow, which is why the tires appear slightly stretched. Stock tire size for the Nismo wheels are 255/40/19 for the fronts and 285/35/19 for the rears. As a buyer, I would either be asking you dismount the tires first or expecting the price to reflect the time and cost for me to do that work.
The other thing working against you is that OEM wheels are generally thought of as not very desirable and often show up sporadically at extremely low prices. Despite the OEM wheels being very high quality, people routinely "upgrade" from stock to (often much) lower quality aftermarket wheels. The prices I look for when it comes to buying OEM wheels in reasonably good condition are usually in the $800 range for sport pkg wheels and $1000 for Nismo wheels. With some patience and luck you can probably get more. Just my
