I think most "pro" style and up Nikon cameras are tested to at least 150,000 shutter actuations, something that the Nikon D780 and D500 are. Mirrorless Nikons have even less moving parts so I think in terms of mechanics you're ok. I think the Z7 is in the same tier of build quality. The only problem is if your prior owner abused the camera especially in adverse weather conditions.
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