I bought two normal BPs from a seller at my first show. I thought it was odd when he told me he would replace them, free, if anything happened. Two weeks later they were doing death rolls, and died. I called him, he asked me to send pics, I did, and he Never called back or answered his phone again. And hasn't been to a show since.
If I could find him ...
This happens all the time. That's why buying at a show isn't always the best way to go.