"also, i sent email to ebay with attached proofs -i will update you once i received reply back from them"

If they won't help you, I recommend you contact eBay through social media.

The staff are far more experienced on those sites.

Send them a private message  detailing everything very clearly.

They'll be able to  see everything  showing in your account and now you have the proof that the parcel's  not arrived in Australia

I recommend trying x first

https://x.com/askebay
https://www.facebook.com/ebay
https://www.instagram.com/ebayforsellers/

TThank you very much, friends ❤️❤️❤️ Previously, all cases were managed by UK staff—if they still respond with NO, I will certainly reach out to them through social media as you all have recommended. I just want to express my gratitude to everyone who attempted to assist me. Thank you so much again 

You really needed AP's email, before launching an appeal to the original finding.  You normally only get one shot at an appeal, and I believe you stated that ebay have advised the case is permanently closed.

Anyway, no harm in pushing buttons, within reason.  Years ago I got a warning from ebay for pushing too many buttons, but I did get a reply to a closed case, did not change the outcome though.

I don't want this to happen. However, when I speak with the AU eBay customer service, they are forwarding my case to the UK team, and I believe that most of the staff are unaware that Royal Mail is a partner of AU Post. Additionally, they are not giving me the opportunity to provide the evidence, which is very frustrating.I sent it to them today. Let see what they said .

From memory, I believe it states that any evidence you wish to be considered, must be provided at the time of making an appeal.  If nothing is provided, except that I don't agree with the decision, then an appeal will be automatically declined.

As the case has been permanently closed in the buyers favor, the only course available to ebay would be to issue a goodwill payment.

Friend no sucess, see the messages 

 1st person show me support however 2nd one treat /talk as UK support staff. Im very disappointed with thier system. No support for sellers .

You were right friend 

So, they’ve passed the buck…..what an expensive lesson…..do not sell internationally!!!!!! 😤

I don’t know whether this might help: 

https://www.cyber.gov.au/report-and-recover/report

"We would not be able to necessarily provide guidance on external  options as I can only speak and advise on eBay matters.

What absolute  rubbish  -  The buyer's been refunded $1500 by eBay !

You have nothing to lose by contacting eBay through social media.

Send a private message  and  outline the problem very clearly

I recommend trying x first

https://x.com/askebay
https://www.facebook.com/ebay
https://www.instagram.com/ebayforsellers/