Usually shadower items ( in my experience ) prices are based on demand then other class items, since there are not alot of scrolled shadower eqpuiment on the market, so its really hard to figure out prices.
I recently bought a 31 d.khanjar for 2.1b, then sold it 3 weeks later for 2.7b. I've noticed an increase in smegas on shad equips so you could try for 3b+
Depends on how desperate the market is, and right now there aren't that many (or none at all) high attack d.khanjars. If you want a quick sale then that's a different story.
Thanks guys Im not in rush to sell it now Im gonna hold on to it for another week or two to get a good price for it