I got a negative feedback for Order #112-7077075-2575466 and a directly refund by amazon, order fulfilled by merchant

The buyer claimed they "did not receive the package and did not get the refund" but FedEx has provided clear photo proof public confirming delivery to the doorstep (Tracking # 881171243135)

and amazon customer service did refund him without any authority

and Despite this evidence:

Public Fedex delviery proof on Fedex Website

The buyer ​never contacted me​ directly to resolve the issue.

Amazon granted a refund without requiring the buyer to open an A-to-Z Claim or allowing me to present delivery documentation.

The negative feedback is factually inaccurate, as the order was fulfilled and delivered as promised.

Anyone help to remove this feedback​?

Can I ​dispute the refund​ retroactively?

Has anyone won similar cases? What’s the secret?

This negative feedback has directly cut my store's sales by half, leaving me extremely frustrated. Anyone Help

Thanks