how likely do you think it is that you will get this information? (trace/mode c)
Quite likely I'd think, a similar thing happened to me a few years back doing a few orbits over the parents house on the Wirral, somebody on the ground decided I too was well below 500' and wrote letters, one to the flight school I hired from and one to LPL ATC. "serious breach of Rule 5" "having studied the ANO" "risking inocent lives on the ground with stupidity"
ATC investigated using mode c data and acoustic monitoring data and the lowest I went to was 596' AGL....
Then we can all feed someone some humble pie!
I was asked if I'd like to respond to the complainant, which I did thanking him for pointing out I can fly 96' lower next time, which I did.