Seems as though some people are going to a third party (investigator?) to try and just identify the victim because that would blow a hole in his denial there is no "Becky".
They definitely should not do that at all. They need to leave it with the police. As I said previously, the police tracked me down and name dropped a JW who had harmed me. Then pandoras box wa open. He got 7 years (not enough) for what he did to 8 girls, myself included up and down Scottish congregations and into Lancaster in England. Everytime he was caught, he fled to another congregation and the JW's, reappointed him as elder numerous times.
So if the police could find me, then they definitely can find this "Becca" and we should leave it in the hands of the governing authorities.