Re: How can I track my AirPods through find my again?
The replacement AirPod likely has a different serial number than the original:
You may want to check the set-up of your AirPod-replacement
See: Set up your replacement AirPods or charging case - Apple Support
If needed: See: How to reset your AirPods and AirPods Pro - Apple Support
You can also browse through : Set up Find My on all your devices - Apple Support for tips
Eg: says:
"Set up your AirPods or Beats headphones
If you pair your AirPods or Beats headphones with your iPhone or iPad, they show up in your Devices list in the Find My app. You can use Find My to locate or play a sound on them. If your AirPods support the Find
My network, you can also mark them as lost.
Note: If you pair your AirPods or Beats headphones when your iPhone or iPad is not connected to a data network (such as 3G, 4G, LTE, or Wi-Fi), you may not have access to all the Find My features.
For more information, see any of the following:
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Also:
See what to do: If Find My is offline or not working - Apple Support
If all else fails::
AirPods Support Website:
Find all the topics, resources, and contact options you need for your AirPods...
AirPods Support - Official Apple Support
All the best :-)