I have seen it several times, changing out good or better parts for some junk. That is why I always stamp my parts in a hidden spot and check upon return. In my early years I sent in a set of "X" heads to be freshen up and was called a couple days later and was told they were junk. I did not leave them and picked them up. Upon inspection I noticed the valve seats were pitted like they had water damage. They came out of a running 69' Dart. I learned the hard way, but have used this technique sense. I have caught others scamming this way, not only with cars, but others in doing for me. I hid a live termite in a basket of clothes during a fumigation that I felt that I did not need (another scam) and after they finished and removed the tarp, I showed the Bossman the live and kicking termite. He had his crew reinstall the trap and redid the fumigation with the Vikane gas, that should of been used at first. "Fool me 1st, it's your fault, fool me again, it's mine". I have also sold parts the same way. "SAD"
