'99 Legacy sedans with similar mileage and options are going for like $6k…
Good luck with the sale though.
And pictures really do help.
Also, not being an ass, but where are you getting your book value from?
http://www.nadaguides.com/usedcars.aspx?LI=1-21-1-5013-0-0-0&l=1&w=21&p=1&f=5014&y=1999&m=1212&d=972&c=16&mi=136600&o=80~85&vi=14110&z=14052&da=-1&nx=1