Spice Jet Airlines — Theft by Airlines Staff

My father Mr. Nanakram Bhojwani travelled from Delhi To Dubai on 25July 2023. Flight no. SG 11 . Morning flight of Spicejet Airlines.
My father submitted the luggage to a lady staff of spicejet. When he reached dubai airport he saw bag was unlocked and then he checked the bag from inside. He found all precious things stolen like mobile cash and jewellery.

I filed FIR to delhi police still no result.
I hope you can help me in this.