AirPods Missing

Re: "AirPods missing: the theory was to know When I used them and knowing where I was at during that time"

What do you remember ... or see if Apple Support's online articles can help:

Find your lost AirPods with Find My - Apple Support

says:

If your AirPods are "Offline" or show "No location found"

• If your AirPods are out of range or need to charge, you might see their last known location. You might also see "Offline" or "No location found."
• You might be able to get directions to their last known location — but you won't be able to play a sound or use Find Nearby.
• If they come back online, you get a notification on your iPhone (or other Apple device that you use them with).

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Important: To use the Find My app to locate AirPods when they’re offline,

the Find My network must be on before they’re lost.

More info in the article: Turn on the Find My network - Apple Support

and

Note: To mark your AirPods as lost, the Find My network must be on before AirPods are lost.

How to: Mark AirPods as lost - Apple Support

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Also: If Find My is offline or not working - Apple Support

AirPods Support Website: Find all the topics, resources, and contact options you need for your AirPods....

AirPods Support - Official Apple Support