Russian buyer is trying to scam me. Advice needed please

[pogdeals]

Hi all

I've got an issue with a buyer from Russia who has purchased an iphone 11 pro max mobile phone from me. They're claiming that the phone that they received is an older model. They sent a picture of an iphone 8 box with the opened packaging next to it. I believe they're trying to scam me. The buyer is a new buyer with 0 feedback.

Before I posted the phone out I video'd myself packaging the correct phone with the serial number and weight. I've requested a confirmation of weight from Royal Mail but have not yet received a reply.

I've reported the buyer to action fraud and gotten a reference number which I've added to the case, I've also uploaded screenshots of me packaging the correct device to the open case. 

The case was escalated and ebay have asked me to provide them with a return label within 5 days! I can't believe they're believing the scammer and feel quite helpless!

Does anybody know how I can win this or what else I can do? I'm worried that even if I do send them a return label they'll probably send me a bunch of rocks or something. 

Thanks in advance for all the help

[plpmr]

you won't win any case and eBay will force a refund.

If you don't arrange for the return quickly eBay will just refund without you getting it back.

Videos won't help  in any way.