Just an idea, I assume the rifle is fairly high end based off of your comments, so I’m assuming there is a high end scope. The scope should have a serial number on it. You could try calling the manufacturer and see if the individual has an account or they might be able to tell you where it was sold at, based on the serial number.
Also, I’m hoping the sheriffs office entered the serial number into the database and listed it as missing, in case the owner ever goes to Leo’s to report it, it would be flagged already at that point.
You might check the rifle to see if there is any other high end parts with serial numbers.
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