At the time of the incident NJ673 was officially allocated to 430 Squadron. As the incident referred to at B78 involved a civilian and a possibly parked/unmanned aircraft, it is possible the operating unit given is the “umbrella” unit. This was 39 Recce Wing which, I believe, comprised 168, 400, 414 & 430 Squadrons.

I wish you well in your search but mention of individual Austers in fighter/reconnaisance squadron ORBs is rare.