With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
They sell cases for you to attach an airtag to your headphones case. And the pro version of the iheadphones have individual find my capabilities. Should allow you to locate all three items provided you remember to look while they still have batteries.