Speakers and components with moving parts are difficult to judge their condition apart from outside blemishes unless you have a listen or close inspection. Electronics on the other hand are easier to check if they have been tempered somehow.
Seller feedback, communication, status, would help up to a point.
Every seller has to promote the listing using the right words that catch the eye. When a component is claimed mint or near mint and you see faults what you have to do is skip.
G