Regardless of instrument type, ask about and inspect the storage history (climate-controlled indoor storage is always preferable to a garage, basement or attic), request close-up photos or video of any area described as damaged, and confirm exactly what's included in the sale (case, accessories, original parts). Ask why the seller is selling and how long they've owned it, since long-term single ownership with a clear reason for selling is generally a more reassuring signal than a rapid resale. When in doubt on anything mechanically or structurally significant, a local specialist's inspection before finalizing a higher-priced purchase is almost always worth the modest cost relative to the risk of an expensive surprise.