If the note references probable cause from a thread and the evidence is on kf, wouldn’t the authorities already have that evidence or be able to get a search warrant for it? Why would they search someone’s house for it?
Basically, they had the allegations and enough substantiating evidence to go to the point of looking for more evidence, but not to get all the way to an arrest/conviction. A search warrant is the next step.
EDIT: Also, the police have most likely downloaded the information, but you never know.