The Missing Trick-or-Treaters incident happened around 20 years ago in Raven Brooks, where Gerda was found to be safe.
It actually partially parallels the current Hello Neighbor 2 Storyline. I would LOVE for the plot to potentially lean into this.
Gathering information and evidence for a case that happened 20 years ago that could lead to a breakthrough in Quentin's investigation.
As they say... "History repeats itself."