India Post — parcel out for delivery but failed to deliver for 2 days

Address:

103,Ashokgarh,DUNLOP (Opp. of DTDC), Kolkata, West Bengal, 700108

Hello,
My parcel(Tracking number : CF[protected]AU) was supposed to deliver yesterday but later it was marked as "undelivered : wrongly directed, redirect tomorrow" on yesterday evening and even today.
My question is, if somehow Pin Code is not mentioned by the sender, please include on the parcel(mine is ISI PO, Kol-108)
And does GPO directly deliver to address or it sent to local PO?.

Sagnik Ghosh

address : 103 Ashokegarh,
Kol-108,
ISI PO