Hi udaykm,
I have the same confusion.
I asked Bluedart services, but they refused to send it to a PO box address. They told they will send it if I write an acknoweldgement letter that incase if courier is missed, bluedart doesnt own the responsibility.
But in CIC website, they have specifically mentioned the mailing address as that of PO box.
Dont know, what to do.