Your best bet is to contact the agent direct. All of Lincoln County listings can be found on realtor.com this includes North Platte and surrounding area. I looked on the MLS and do not find a repo on Sequoia. If you would like to contact me direct with an address you may do so at email@example.com.
If it is listed you can call teh listing agent direct for teh most information, if you would like a buyer agent to find out, simply hire one to assist you. If it is not on the market yet, you may want to see teh contact name an dnumber that may be taped to the door and call them.