on the positive side, it's a small thing monetarily, but retention of company laptops is a nice goodwill gesture
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Is "please arrange for a courier to retrieve it" not the end of your obligations?
There are questions online about "what if a former employee doesn't return their laptop." They almost always end with "send a threatening letter in legalese." They stop after that because the the next step is get a $300 per hour lawyer involved for a $600 laptop.