There is always going to be some level of trust involved with buy non-visual hets. If they show a picture of a lock with one animal being visual, that really helps, but you never know if those are the actual parents or if they might have bred multiple males to a female. I have purchased hets from people that aren't highly reputable and had good results, but I know a lot of people have gotten burned on it. I would say if it's something super expensive, stick with people who have a solid reputation. If it's a cheaper and common one like Pied, a person doesn't have nearly as much incentive to lie and probably is really selling you a het. I don't price my non-visual hets any differently than something without the het, and most people won't for the average priced stuff, so again, not a lot of incentive to lie. Sometimes it's worth giving a smaller seller a chance since its not costing more, and if it proves out great, if it doesn't, no huge loss. When it's some brand new, super expensive morph, people will price even a het at several thousand dollars, and its a different story, but those are projects I wouldn't recommend a person get into in the first place unless they have a lot of experience and reputation.