Hello, i got my imac 27 stolen from my office 3 days ago and i need know if i can find it with the serial number
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You need to report it to the police. You can't trace it by yourself.
There might be a way of tracking the machine provided that the drive wasn't wiped and even then the hardware mac address will still be unchanged (unique) to the hardware nic. If you find the serial you can report it and maybe apple could track it.