Scott,
As you can see in your photo below, anyone with average Photoshop experience can make something broken, look like new. Any given photo could also have been taken prior to damage, say for the sake of recording settings and levels.
The only way to be sure that a photo is authentic is to send the seller a disposable camera that you have in some way marked in a way which could not be noticed or replicated. Have the seller take photos of the product and return the camera to you so that you may have the exposed film processed.
Sorry it happened to you. I'm with those who suggest you take it somewhere for repair. It should be fairly simple for an experienced tech.
