How do I authenticate my genuine AirPods?

The warranty starts running at purchase …

… even if the box is never opened.

That said, I too suspect a scam. Nobody buys AirPods for full list price, holds them unopened for nine months and then resells them — presumably — at a deep discount. 🤔

As it appears the OP actually purchased the product in December 2023, the warranty date would be accurate, and in no way indicates a fake product.

If you purchased them from the Apple Store as indicated, they are genuine.

If somebody else purchased them last year …

… there’s no way for us to tell conclusively from the images if something sketchy has taken place in the intervening 9 months.

Serial number is genuine and the device already activated warranty will finish December 2024. So inside the box there is a chance of fake Airpod. They already took the original and repack same like original. Don’t buy it

How can a person activate any Apple product without opening the box. Airpod is activated same day and still running under warranty. If you never connect with a device how it’s activated ? On the picture it’s sealed but running under warranty also. How ? So you can easily prove it’s something like scam.

Whatever your question might be isn’t clear ???

As you appear to have purchased at an actual Apple Store, I don’t understand why you feel the product is NOT original.

I’m not quite so sure of the provenance.

I suspect the OP is purchasing these “today” …

... and an unidentified “someone else” purchased the genuine AirPods for cash in San Diego last December.

So you have no way of knowing if the photo is what you’d actually be receiving ??? 🫣

SCAM !!!

If the PAST ACTIVATION status is TRUE box surely opened