I have a couple of "new in box" pythons that I paid around $1,500-$2,000 about a year ago. Your best bet is to go "Gunbroker.com" and see if any are in the same condition as your, (ie, unfired, fired in 95%, includes matching box). From your post I gather it's been fired and in "good" condition (some minor blemishes), and does not include the box. I would suspect the price you mentioned is probably fair, around 750-1000.
Good luck