Dg Shipping — Cdc documents verification

I have indian cdc issued in 2004. Recently, in february 2016, i have received a letter from shipping office to resubmit the supportive documents which i have submitted while applying for cdc which are more than 10years old documents. Luckily i found old support documents photostat copies and submitted all that support documents copies in february 2016. And concerned officer verified the documents with original documents like old passport etc. But unfortunately i have received notice from dg shipping office again stating that resubmit the old documents. They didn't mention anything about the documents which i have submitted in february, 2016. With the recent notice, i understand that they didn't keep copies which i have given them in february, 2016. Now i have to go again to resubmit the copies.