Fedex lost my return package

I had returned Apple watch s8 watch more than a month ago. Fedex picked up package from dropbox on 13th September and on the same day evening I got message “departed from fedex location” from then it was not updating and it was showing DELAYED. I have filed a claim in Fedex and it was declined and I called apple support they started investigation and received mail “no further action will be taken by Apple” what to do now ?