I'm in Carbondale so I could take a look at it if you like. If it is a DVC500 then that would explain problems with the chimney, the stove is designed for use without a chimney. The direct vent draws fresh air in around the outlet which wouldn't be so great to try and hook up to a chminey.
See the link for a brochure on how thw stove works:
This link is broken, either the page no longer exists or there is some other issue like a typo.
Also I would say that an ad in the Paper Shop is an effective way to sell it in addition to putting one on the forum. I have had good luck buying and selling coal stoves in there since the audience is in coal country!
The thing to remember is that a stove that has been sitting will probably not bring very much, especially if the door is rusted shut. Although the direct vent model is more expensive and rare than the magnum stoker.
If you have a way to get it the door open, make sure there is no ash or coal left in there. If ash and or coal have been left inside it will probably require dissasessembly before anyone tries to run it since frozen parts can ruin the stoker motor.