What if I don’t have the original receipt for my AirPods

Hello ~ Contact the Apple Store that you bought them at perhaps they can help with the receipt:

https://locate.apple.com/

~Katana-San~

You don't need the receipt.

Warranty can be determined form the serial number on the charging case and each AirPod.

Hello again ~ You are welcome and see*Phil0124’s* post.

~Katana-San~

Does not matter where you bough them. Take them to an Apple Store to Authorized service provider such as Best Buy.