Don,
At a European airfield a year or 3 ago, the other DCP at that time was forced to backfile an ASR he "forgot" to file.
The aircraft landed, "assumed" to be hard, and the engineer was consulted while a delay was evident.
The outgoing Captain queried the delay to boarding the aircraft. When finding out the reason for the delay, the outgoing Captain (TRE) filed an ASR for there not being an ASR for the "assumed" heavy landing previously!
Why should one file an ASR to oneself if DCP as it seems to be the case when they were there when it happened!
Jack