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It's what they do, and they have done it for a very long time.
Not all do as your link site suggests.
Without serials there's no chance of recovery or little specific info for a police report other than description and of course there's a need to updated the police's list of stolen firearms by serial # which is shared with local pawn shops and guns shops so's to be aware of.
Homeowner insurers: is [suggest only] to buy a safe or cabinet & install alarm.
In this State new FFL licensee's: ATF now [requires] a safe on premises. In size and meeting specific build quality.
I highly doubt a Stack-on cabinet meets those ATF guidelines."
Because Collectinsure does not require serial numbers means nothing.
OF COURSE if your guns were stolen you would report the serial numbers to the police!
THEY are the ones responsible for recovery, not the insuror. The insuror only pays for the lost/stolen items.
Last time I checked , Collectinsure was much cheaper than a rider on my homeowner's policy.