Warranty service in India?
I recently gave a gift of AirPods to someone in India. The AirPods were bought in USA. One of the stem didn't work out of the box. When the recipient tried to get warranty service, the authorized Apple service center in India refused to provide service without an invoice. I bought the device at Costco. The Costco invoice doesn't show a serial number, all it shows is the item description, the Costco item number, and the price. This is not enough for them.
The serial number and warranty expiration date shows up in "Settings". Shouldn't that be enough to get warranty service? How do I get the service center to do the right thing?