St Courier — before delivery opened the parcel and taken the product

Address:

Triplicane high road, Triplicane, 600005

I have sent some artificial jewelry the value is around 7500/- while dispatching the things the courier people they haven't inform me that these kind of stuffs is allowed to send. They themself packed and sent. Before delivering they have opened the parcel and taken one pearl jewel which the value is around 2000/-
Other stuffs are reached but with parcel opened.