I have purchased many items that did not have any photos.
All of these were listed as new in original box. Every thing has been great.
If a number and description is listed, you can look that up and see if it the correct item, also ask questions.
Many sellers who do not post pictures are explicit on stating any or all flaws.
I always look at their profile page to see when they joined the forum, will not buy from a newbie.
I think of this forum as a community, where they are just a modeler like you and need to trade or dispose of their older trains.
Maybe I trust too much, but I never bought a bridge yet