I sent my PP Renewal package last week. I emailed them earlier about the origiinal citizenship certificate. They asked for the originals. However, they said if we send the copies, they will take time for the verification of the copies through the administration in Nepal, so it will add up significant time for processing. Luckily, I had my originals with me, so I sent the originals. Hopefully, they will process soon. 

Good Luck, siliconhills.