kribnutz

The originals will be returned to you at the time of the interview.
Nothing you can do but send them into NVC if you want your case to be completed.
A lot of people have tried to get away with photocopies or notarized copies but they've all been RFE-d for those documents.
Only ORIGINAL/CERTIFIED COPY is acceptable to NVC.

The ORIGINAL PCCs will be sent with the IV packet which will carry the DS230 form. The NVC stage starts once you have the NOA2.
It is recommended that a photocopy of the PCCs are carried to the interview.
A guide to the DS230 packet for Indian beneficiaries:
--Cover sheet for Immigrant Visa Bill of $400.
--Two (2) Passport Size Photographs of Beneficiary (Beneficiary's full name, and date of birth are written on back of both).
--DS-230 Part 1 completed and signed by beneficiary.
--DS-230 Part 2 completed by beneficiary, unsigned, as of yet, per instructions.
--Original Marriage certificate
--Photocopy of Marriage Certificate
--Original Birth Certificate
--Photocopy of Birth Certificate
--Original Police Clearance Certificate from Local Police Station, Calcutta
--Original Police Clearance Certificate from Regional Passport Office, Calcutta
--Photocopy of beneficiary's Indian passport.
Get on those PCCs ASAP. They are valid for 1 year for embassy purposes.

You will need two PCCs for India before your case can be completed at NVC.
Smart thing to do is to get them while you wait for your NOA2.
The Police Clearance Certificate will come from the local police station of your current residence. This basically looks like a letter. Has your picture on it (or at least mine did), some stamps and a signature. For this, a copy of the passport was sufficient.
The Passport Clearance Certificate will be issued by your passport issuing Regional Passport Office. This one came with a stamp in the passport and a note saying the applicant was cleared for U.S. immigration purposes. Obviously, for this I had to submit my original passport.
My Police CC took 3 weeks and Passport CC took 1 week. This was in Calcutta.
Hope this helps.
The PCCs will have to be sent to NVC with your DS230/IV packet.