Over the last few decades I have completed quite a few AIRPROX reports. These days I don't bother because I found nothing useful comes from doing so, except to inform me I had a near miss, which I obviously knew already.
The last time I was informed that the pilot of the other aircraft (which descended from left to right and above, right across us, about fifty metres away) blamed me, despite not seeing us and so failing to give way iaw the rules of the air, stating I should have been on "his" local A/G frequency, although we were 14 nm from his airfield and in the process of contacting a radar unit.
Same with "LASER" reports. I've made statements on more than one occasion but nothing seems to be done. The last two times I was able to locate the exact source of the perpetrator. On the last occasion CCTV might well have been available. Nothing was done to collect evidence.