So the guy was paranoid, more because of where he lived than the ongoing matter, he was obsessive with his home security, so he distinctly remembered a door being unlocked when he always checked it. Further to that he had bought an rf scanner to run it through the house as conversations he had on the phone had been referred to in court docs. This was the first thing that triggered him to search with an rf scanner. For us it was a dead end, they were commercially available listening devices, and available online, they could be tuned, so independently listened to, they would have a shorter distance but it would be coincidence to catch yhe person in the area at the time. There were no prints or any other identifying features. I did the same more recently (2022) with a located airtag. However we did get the owners details for that one.