Bluetooth Challenge

Screen recording of a bluetooth search on my phone Nov 2023 in an open area with only school children ats sports practice. They are not allowed mobile phones these were over 500m away in the changing rooms. Found 24 "unknown" bluetooth MAC codes that shold not exist as they have no known identifier. (Every proper bluetooth MAC has a device and manufacturer identifier in the MAC code, which can be looked up here : https://maclookup.app/search