[thunderbirdmike]

I just did this yesterday with a pair of headphones I ordered from Amazon.

My dog ate one of the replacement earpieces (the earbuds still work fine, of course). So I just got on Amazon customer service chat and said there was an ear piece missing. She immediately offered me a partial refund, which I declined.

And then she offered to send me a new pair (no charge) and told me to keep the "damaged" pair I already have.

Works!