That is a ridiculous accusation for you to make - that people were not truthful when they sent their device! Sure - some people may be deceptive but if you read all the complaints - NUMEROUS people send perfectly good devices and then are told they are broken.
In my case, from the moment I bought my iPhone, it was kept in an OtterBox and had a tempered glass cover on it. The device they sent back to me looked like there had been a sticker on the back of it and it had pixel problems in the middle of it. I am now researching to see if the phone they sent back is the actual phone that I sent them.
Think about it for just a minute and you will realize that if they bait and switch phones, they can make some good money from Apple.
Apple needs to get rid of Phobio, or at the very least, Phobio needs to get rid of some of their employees. Or, do not allow trade-ins via email. Make people take them to the Apple store.