Actually for vendors you can probably deanonymize yourself very quickly by saying things about yourself. LE is already aware of your rough location based on shipping information. So if you say something like "fuck I got in a car wreck the other night" law enforcement can quickly check records of such events and find a list of potential suspects. Even saying something as innocent as "I rented this movie within the past two weeks" can get your name on a short list of suspects. I would say this sort of attack is the leading cause of deanonymization in people who are technically secure.