The 830 record is a wonderful machine. If you don't want them, I am sure you will be able to find buyers easily. If they were cleaned and in good order you would get much more money for them, but you would also be very tempted to keep them. I love mine.
Are the two nylon gears intact inside? Typically the main issue this model has is a cracked cam stack gear or an upright gear. They are a part that can be replaced but a buyer would want to know if this is the case.