It could be a stolen, lost, demo or counterfeit item. Contact Phonak with the serial number but don’t tell them you brought it off eBay.
One possibility for them not coming back with a serial number match is they could have been sold in Europe originally.
I’m hoping it still works and I can just use it.
I know I won’t be able to send it in for repair.
The seller has offered to give me my money back and he doesn’t want me to send it back either.
I bought it from the USA and I live in the UK.