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First thing I would check that a police report was filed to make sure he's being honest about the break in.....
There is a chance that business has been slow and his insurance lapsed and he couldn't afford to pay out of pocket to replace?
Or that filing a claim for only 3 trimmers wouldn't be worth the rate increase.....
I don't think anyone with a good reputation would risk it in this scenario, if that is the case.....
Maybe employee theft? That would be more damaging than anything as it would make you question the trust to deal there....why would someone grab a beat trimmer? Would be harder to fence...but easier to cover up.....
I would have a one on one with him (being civil of course), I'm sure he'd fix the one he gave you at no charge.....there may be more going on internally than you're aware of....