Wait to late tonight when everything is as quiet as possible. Call the phone and use your son's good ears to listen for the faint low frequency vibrate sound. Good luck.
I know losing a device is never a fun thing to have to go through. What type of device does your son have? If it is a smartphone (ex: iPhone or Android) you may be able to track it. Basic phones unfortunately do not have that capability.
If you end up having to use your insurance, you can always reach Aurion at: www.asurion.com
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