India Post — non delivery of an article...

I have posted a very valuable personal belongings by speed post from kalyan (Maharashtra) katemaivali speed post office on the 1st of september, 2017. The receipt no. Is em[protected]in. Unfortunately the parcel has not yet delivered its destination i. E udaipur, rajasthan. Till date. I've tried tracking from the internet but is not traceable. Kindly check and do the needful...