Can't find my receipt to get my airpods fixed

Hi eoin6163,

Welcome to the Apple Community.

Apple often eMail a receipt for purchases, if you agree.

You might want to try searching your Mail for eMails from Apple.

(or eMails around the approx. date of purchase.)

Search for emails in Mail on Mac

https://support.apple.com/en-au/guide/mail/mlhlp1003/mac

Search for email in Mail on iPhone

https://support.apple.com/en-au/guide/iphone/iphb2eab8035/ios

or

Would you have filed a photocopy of the receipt ?

or

If you saved the packaging, the receipt may be with it ?

or

If you had / have Apple Care, you may have proof of coverage.

Hope this helps :-)