And tech used the part during a repair, did system configuration with the board, realized that wasn't the issue, and then removed it and sent it to back to appl

And tech used the part during a repair, did system configuration with the board, realized that wasn't the issue, and then removed it and sent it to back to apple. I've had a tech do it once. I'm not sure how the "Diag" board would have ended up in the hands of a customer. We note that the part was opened and used.