Check the glass elements for any mold/oil spots, make sure the AF works, check the AF/MF clutch, overall cleanliness of lens, zoom in/out.
I'd also take a few photos at 70, 120, 160, 200 and see if the focus is spot on (not like it can't be micro-adjusted). If you focus on something and it is off quite a bit, that can be a sign of a problem. Make sure the OS works as intended too.
Not sure what you have there, but you should also try looking up the serial to make sure it isn't stolen.
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