According to step 3 of the instruction guide, you just have to provide 1 more government issued ID if you had passport for the past 5 years. So, I just photocopied the both sides of my PR card and sent it along with copies of my passport! I hope I didn't make a mistakesome of us sent it with the following
1. one copy of CoPR
2. one copy of PR card (both sides)
3. copy of passport
4. two other IDs: health card and school record
5. another copy of passport to annex to health card since there is no picture
others sent different iterations of those same documents.