Found it in less than 5 minutes – Tracker & Finder for Fitbit Review

Downloaded it. Wandered around the house. At first I though it wasn't working because there were some false positives which corrected themselves within seconds. Probably just calibrating the Fitbit signal. Ended up finding the Fitbit in a pile of clothes. As an added bonus, it picked up every single Bluetooth item in the house (so I can just it for other things too!) Thank you!!
Review by Acquired TBI on Tracker & Finder for Fitbit.