A well-known 19th century English judge summed up the issues thus

“Counsel for the defendant has very properly told you, members of the jury, that it is no part of the law of England that a man who in selling goods has got to say harsh things about them. He is quite right. A fishmonger is under no obligation to cry ‘stinking fish, stinking fish’, but if he knows that his fish do stink he is not entitled to cry falsely “fresh fish, fresh fish’, nor is he any the more entitled to do that if he happens to know that his customer cannot smell.”

By analogy, I try to follow these principle

1. Don't downplay your product any more than circumstances require, but

2. Don't describe something in terms you know to be false, and  

3. If you know there's a flaw in the product which a buyer cannot see ("smell") on the scans, specify it in your description.

Do unto others, etc.

Neither suggestio falsio, nor suppressio veri.