D50 wrote:
Since you own a D7000 what are the key features that should be checked and
what else should I look for
The shutter count indicates relative usage. The shutter is estimated to 150,000. I'd prefer to see a camera below half-way, 75,000ish. Then, how much visual external wear corresponds with that usage count (more / less / as expected)?
The real issue is the price. You mentioned no warranty. The more relevant issue is there is no repair option either, not for a camera that old, released in 2010 and discontinued in 2013. So, the camera should be 'discounted' for the age, the 16MP ancient technology, and the relative amount of wear. If it was lightly used, say less than 50k on the shutter, there might be an argument for a relatively higher price.
Things to check:
a) dust on the sensor (shoot a white ceiling at f/22).
b) the histogram display, shoot something that generates highlight warnings
c) the image playback.
d) a multi-second burst.
e) both RAW and JPEG recording.
f) status / version of firmware.
g) mount / dismount / remount and random, but real, test shots with your preferred DX / FX lens.
h) battery status - original Nikon or third-party? Does it read fully-charged when the camera is reviewed?
Personally, I wouldn't pay more than $200 for a D7000. A better price is $175 or anything lower, and $175 would be for a pristine specimen only driven to church on Sundays. For the strap, unless still new in plastic, throw this germ-rag away and buy a new one. Make sure the camera includes the body cap, battery(s) and charger. You don't need a box nor any paper-based documentation, don't pay more for that nonsense either.