catch22,
First off welcome to the forum

! This is a great site. I am sure someone familiar with that stove will chime in soon. I am unfamiliar with that particular unit but..... a few things I would do are...
1. Do some research on the Internet... oh wait you are here. Well see if you can find some reviews on line of the stove, or at least some dealer info on the stove.
2. Find out what the retail price of the stove is today if they still make it, and was 3 years ago when they bought it. Is the asking price high for a 3 year old stove ?
3. Find out what type of burning technology the stove uses, and if it is EPA certified.
4. Find out what size flue you need, and what you will need to do to install it. No scense in getting a good deal on a stove that costs a fortune to retrofit in the home.
5. Get pics, a ton of pics. If you can post them here then that would be great

6. When inspecting stove, look for warps, and cracks
7. Be sure all moving parts- door, air intake control, everything- moves corectly.
8. I would even do a dollar bill test to check all the gaskets,( yes you can easily replace them but....if they don't seal correctly was the unit burned like that?
That is what I would do to start if I were buying a "new" used stove.
Shawn