> most police departments won't pay the slightest bit of attention to your reports

Its sort of a combination of two reasons.

First in many cities, police departments are underfunded. And so running around looking for your stolen phone or whatever minor item is low on their to-do list compared to say, stopping the local drug-gangs from shooting their brains out.

Second, for minor thefts most insurance companies just need a quick box-tick "police crime report number" before paying out. So if the police know they can get you off their backs just by quickly giving you a report number, well....