How do I find my AirPods if they are in the case

Look for them the old fashioned way, with your eyes.

If they aren't connected by Bluetooth to a device, they aren't trackable.

See if this helps: https://support.apple.com/en-us/HT207581.

destinee54 Said:

"How do I find my AirPods if they are in the case"

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For Thought:

Backtrack your Locations (i.e Retailer,  Restaurant, School, Hotel, etc.), calling them, or going there in person. Perhaps it was placed aside, in a "Lost & Found" location. Also, contact the Local Law Enforcement Agency. Perhaps it was handed over. You never know. :)